12900440 has 32 divisors (see below), whose sum is σ = 33173280. Its totient is φ = 4422912.

The previous prime is 12900403. The next prime is 12900443. The reversal of 12900440 is 4400921.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12900443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22757 + ... + 23316.

It is an arithmetic number, because the mean of its divisors is an integer number (1036665).

Almost surely, 2^12900440 is an apocalyptic number.

12900440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12900440 is an abundant number, since it is smaller than the sum of its proper divisors (20272840).

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

12900440 is a wasteful number, since it uses less digits than its factorization.

12900440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46091 (or 46087 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 12900440 is about 3591.7182517564. The cubic root of 12900440 is about 234.5316763371.

The spelling of 12900440 in words is "twelve million, nine hundred thousand, four hundred forty".