Search a number
-
+
129940 = 2257389
BaseRepresentation
bin11111101110010100
320121020121
4133232110
513124230
62441324
71050556
oct375624
9217217
10129940
1189698
1263244
13471b5
14354d6
152877a
hex1fb94

129940 has 24 divisors (see below), whose sum is σ = 279720. Its totient is φ = 50688.

The previous prime is 129937. The next prime is 129953. The reversal of 129940 is 49921.

129940 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 4 ways, for example, as 4624 + 125316 = 68^2 + 354^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416 + ... + 1504.

It is an arithmetic number, because the mean of its divisors is an integer number (11655).

2129940 is an apocalyptic number.

129940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129940 is an abundant number, since it is smaller than the sum of its proper divisors (149780).

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

129940 is a wasteful number, since it uses less digits than its factorization.

129940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 129940 is about 360.4719129142. The cubic root of 129940 is about 50.6501754578.

The spelling of 129940 in words is "one hundred twenty-nine thousand, nine hundred forty".

Divisors: 1 2 4 5 10 20 73 89 146 178 292 356 365 445 730 890 1460 1780 6497 12994 25988 32485 64970 129940