12403920 has 40 divisors (see below), whose sum is σ = 38452896. Its totient is φ = 3307648.

The previous prime is 12403901. The next prime is 12403921. The reversal of 12403920 is 2930421.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403921) by changing a digit.

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, 25602 + ... + 26081.

Almost surely, 2^12403920 is an apocalyptic number.

12403920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12403920 is an abundant number, since it is smaller than the sum of its proper divisors (26048976).

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

12403920 is a wasteful number, since it uses less digits than its factorization.

12403920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51699 (or 51693 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 12403920 is about 3521.9199309468. The cubic root of 12403920 is about 231.4832931761.

The spelling of 12403920 in words is "twelve million, four hundred three thousand, nine hundred twenty".