12390816 has 48 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 4107264.

The previous prime is 12390803. The next prime is 12390823. The reversal of 12390816 is 61809321.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×12390816² = 307064642291712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32161 + ... + 32543.

It is an arithmetic number, because the mean of its divisors is an integer number (681408).

Almost surely, 2^12390816 is an apocalyptic number.

12390816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12390816 is an abundant number, since it is smaller than the sum of its proper divisors (20316768).

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

12390816 is a wasteful number, since it uses less digits than its factorization.

12390816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12390816 is about 3520.0590904131. The cubic root of 12390816 is about 231.4017483664.

The spelling of 12390816 in words is "twelve million, three hundred ninety thousand, eight hundred sixteen".