12898638 has 12 divisors (see below), whose sum is σ = 27947088. Its totient is φ = 4299540.

The previous prime is 12898621. The next prime is 12898643. The reversal of 12898638 is 83689821.

12898638 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 8 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12898593 and 12898602.

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 5 ways as a sum of consecutive naturals, for example, 358278 + ... + 358313.

It is an arithmetic number, because the mean of its divisors is an integer number (2328924).

Almost surely, 2^12898638 is an apocalyptic number.

12898638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12898638 is an abundant number, since it is smaller than the sum of its proper divisors (15048450).

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

12898638 is a wasteful number, since it uses less digits than its factorization.

12898638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716599 (or 716596 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 12898638 is about 3591.4673881298. The cubic root of 12898638 is about 234.5207556305.

The spelling of 12898638 in words is "twelve million, eight hundred ninety-eight thousand, six hundred thirty-eight".