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1281329940 = 2235111941409
BaseRepresentation
bin100110001011111…
…1000101100010100
310022022001022020110
41030113320230110
510111010024230
6331051203020
743516060542
oct11427705424
93268038213
101281329940
115a8306170
122b9146470
131755cbcc7
14c2260d92
15777534b0
hex4c5f8b14

1281329940 has 48 divisors (see below), whose sum is σ = 3913882560. Its totient is φ = 310625280.

The previous prime is 1281329921. The next prime is 1281329941. The reversal of 1281329940 is 499231821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281329941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 970045 + ... + 971364.

It is an arithmetic number, because the mean of its divisors is an integer number (81539220).

Almost surely, 21281329940 is an apocalyptic number.

1281329940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281329940 is an abundant number, since it is smaller than the sum of its proper divisors (2632552620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281329940 is a wasteful number, since it uses less digits than its factorization.

1281329940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941432 (or 1941430 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1281329940 is about 35795.6692911307. The cubic root of 1281329940 is about 1086.1429594504.

The spelling of 1281329940 in words is "one billion, two hundred eighty-one million, three hundred twenty-nine thousand, nine hundred forty".

Divisors: 1 2 3 4 5 6 10 11 12 15 20 22 30 33 44 55 60 66 110 132 165 220 330 660 1941409 3882818 5824227 7765636 9707045 11648454 19414090 21355499 23296908 29121135 38828180 42710998 58242270 64066497 85421996 106777495 116484540 128132994 213554990 256265988 320332485 427109980 640664970 1281329940