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12904390 = 251290439
BaseRepresentation
bin110001001110…
…011111000110
3220021121111101
4301032133012
511300420030
61140330314
7214454062
oct61163706
926247441
1012904390
117314294
1243a399a
13289a845
1419dcaa2
1511ed7ca
hexc4e7c6

12904390 has 8 divisors (see below), whose sum is σ = 23227920. Its totient is φ = 5161752.

The previous prime is 12904373. The next prime is 12904399. The reversal of 12904390 is 9340921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12904399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645210 + ... + 645229.

It is an arithmetic number, because the mean of its divisors is an integer number (2903490).

Almost surely, 212904390 is an apocalyptic number.

12904390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12904390 is a deficient number, since it is larger than the sum of its proper divisors (10323530).

12904390 is a wasteful number, since it uses less digits than its factorization.

12904390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290446.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 12904390 is about 3592.2680857642. The cubic root of 12904390 is about 234.5556110655. Note that the first 3 decimals are identical.

The spelling of 12904390 in words is "twelve million, nine hundred four thousand, three hundred ninety".

Divisors: 1 2 5 10 1290439 2580878 6452195 12904390