12651440 has 20 divisors (see below), whose sum is σ = 29414784. Its totient is φ = 5060544.

The previous prime is 12651437. The next prime is 12651467. The reversal of 12651440 is 4415621.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78992 + ... + 79151.

Almost surely, 2^12651440 is an apocalyptic number.

12651440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12651440 is an abundant number, since it is smaller than the sum of its proper divisors (16763344).

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

12651440 is a wasteful number, since it uses less digits than its factorization.

12651440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158156 (or 158150 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 12651440 is about 3556.8862787556. The cubic root of 12651440 is about 233.0129116608.

The spelling of 12651440 in words is "twelve million, six hundred fifty-one thousand, four hundred forty".