187213864 has 8 divisors (see below), whose sum is σ = 351026010. Its totient is φ = 93606928.

The previous prime is 187213849. The next prime is 187213883. The reversal of 187213864 is 468312781.

It can be written as a sum of positive squares in only one way, i.e., 156500100 + 30713764 = 12510^2 + 5542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11700859 + ... + 11700874.

Almost surely, 2^187213864 is an apocalyptic number.

It is an amenable number.

187213864 is a deficient number, since it is larger than the sum of its proper divisors (163812146).

187213864 is a wasteful number, since it uses less digits than its factorization.

187213864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23401739 (or 23401735 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 187213864 is about 13682.6117389919. The cubic root of 187213864 is about 572.0658228651.

The spelling of 187213864 in words is "one hundred eighty-seven million, two hundred thirteen thousand, eight hundred sixty-four".