212185864 has 16 divisors (see below), whose sum is σ = 434016720. Its totient is φ = 96448080.

The previous prime is 212185859. The next prime is 212185867. The reversal of 212185864 is 468581212.

It is not an unprimeable number, because it can be changed into a prime (212185867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205514 + ... + 1205689.

It is an arithmetic number, because the mean of its divisors is an integer number (27126045).

Almost surely, 2^212185864 is an apocalyptic number.

It is an amenable number.

212185864 is an abundant number, since it is smaller than the sum of its proper divisors (221830856).

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

212185864 is a wasteful number, since it uses less digits than its factorization.

212185864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411220 (or 2411216 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 212185864 is about 14566.6009762058. The cubic root of 212185864 is about 596.4473991540.

The spelling of 212185864 in words is "two hundred twelve million, one hundred eighty-five thousand, eight hundred sixty-four".