212865804 has 18 divisors (see below), whose sum is σ = 538077540. Its totient is φ = 70955256.

The previous prime is 212865803. The next prime is 212865833. The reversal of 212865804 is 408568212.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5912939 = 212865804 / (2 + 1 + 2 + 8 + 6 + 5 + 8 + 0 + 4).

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (212865803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2956434 + ... + 2956505.

Almost surely, 2^212865804 is an apocalyptic number.

It is an amenable number.

212865804 is an abundant number, since it is smaller than the sum of its proper divisors (325211736).

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

212865804 is a wasteful number, since it uses less digits than its factorization.

212865804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912949 (or 5912944 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 212865804 is about 14589.9213157577. The cubic root of 212865804 is about 597.0838160815.

The spelling of 212865804 in words is "two hundred twelve million, eight hundred sixty-five thousand, eight hundred four".