11391972 has 24 divisors (see below), whose sum is σ = 28145376. Its totient is φ = 3573888.

The previous prime is 11391953. The next prime is 11391977. The reversal of 11391972 is 27919311.

It is not an unprimeable number, because it can be changed into a prime (11391977) 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, 27718 + ... + 28125.

It is an arithmetic number, because the mean of its divisors is an integer number (1172724).

Almost surely, 2^11391972 is an apocalyptic number.

11391972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11391972 is an abundant number, since it is smaller than the sum of its proper divisors (16753404).

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

11391972 is a wasteful number, since it uses less digits than its factorization.

11391972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55867 (or 55865 counting only the distinct ones).

The product of its digits is 3402, while the sum is 33.

The square root of 11391972 is about 3375.1995496563. The cubic root of 11391972 is about 225.0088687862.

The spelling of 11391972 in words is "eleven million, three hundred ninety-one thousand, nine hundred seventy-two".