12990426 has 32 divisors (see below), whose sum is σ = 27027456. Its totient is φ = 4158000.

The previous prime is 12990421. The next prime is 12990427. The reversal of 12990426 is 62409921.

It is a super-2 number, since 2×12990426² = 337502335322952, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12990421) 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, 39081 + ... + 39411.

It is an arithmetic number, because the mean of its divisors is an integer number (844608).

Almost surely, 2^12990426 is an apocalyptic number.

12990426 is an abundant number, since it is smaller than the sum of its proper divisors (14037030).

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

12990426 is a wasteful number, since it uses less digits than its factorization.

12990426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 12990426 is about 3604.2233560089. The cubic root of 12990426 is about 235.0757323442.

The spelling of 12990426 in words is "twelve million, nine hundred ninety thousand, four hundred twenty-six".