213805912 has 8 divisors (see below), whose sum is σ = 400886100. Its totient is φ = 106902952.

The previous prime is 213805901. The next prime is 213805919. The reversal of 213805912 is 219508312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213805919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13362862 + ... + 13362877.

Almost surely, 2^213805912 is an apocalyptic number.

It is an amenable number.

213805912 is a deficient number, since it is larger than the sum of its proper divisors (187080188).

213805912 is a wasteful number, since it uses less digits than its factorization.

213805912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26725745 (or 26725741 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 213805912 is about 14622.1035422404. The cubic root of 213805912 is about 597.9615192070.

The spelling of 213805912 in words is "two hundred thirteen million, eight hundred five thousand, nine hundred twelve".