11978972 has 24 divisors (see below), whose sum is σ = 22280160. Its totient is φ = 5624640.

The previous prime is 11978959. The next prime is 11979029. The reversal of 11978972 is 27987911.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2897 + ... + 5687.

It is an arithmetic number, because the mean of its divisors is an integer number (928340).

Almost surely, 2^11978972 is an apocalyptic number.

It is an amenable number.

11978972 is a deficient number, since it is larger than the sum of its proper divisors (10301188).

11978972 is a wasteful number, since it uses less digits than its factorization.

11978972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2859 counting only the distinct ones).

The product of its digits is 63504, while the sum is 44.

The square root of 11978972 is about 3461.0651539663. The cubic root of 11978972 is about 228.8090422609.

The spelling of 11978972 in words is "eleven million, nine hundred seventy-eight thousand, nine hundred seventy-two".