12891672 has 24 divisors (see below), whose sum is σ = 34915140. Its totient is φ = 4297200.

The previous prime is 12891653. The next prime is 12891713. The reversal of 12891672 is 27619821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89454 + ... + 89597.

Almost surely, 2^12891672 is an apocalyptic number.

12891672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12891672 is an abundant number, since it is smaller than the sum of its proper divisors (22023468).

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

12891672 is a wasteful number, since it uses less digits than its factorization.

12891672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179063 (or 179056 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 12891672 is about 3590.4974585703. The cubic root of 12891672 is about 234.4785298346.

The spelling of 12891672 in words is "twelve million, eight hundred ninety-one thousand, six hundred seventy-two".