12491920 has 40 divisors (see below), whose sum is σ = 33194304. Its totient is φ = 4282752.

The previous prime is 12491917. The next prime is 12491933. The reversal of 12491920 is 2919421.

It is a happy number.

12491920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 10594 + ... + 11713.

Almost surely, 2^12491920 is an apocalyptic number.

12491920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12491920 is an abundant number, since it is smaller than the sum of its proper divisors (20702384).

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

12491920 is a wasteful number, since it uses less digits than its factorization.

12491920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22327 (or 22321 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 12491920 is about 3534.3910366568. The cubic root of 12491920 is about 232.0294255186.

The spelling of 12491920 in words is "twelve million, four hundred ninety-one thousand, nine hundred twenty".