213405812 has 12 divisors (see below), whose sum is σ = 376311936. Its totient is φ = 105888120.

The previous prime is 213405763. The next prime is 213405839. The reversal of 213405812 is 218504312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203108 + ... + 204155.

It is an arithmetic number, because the mean of its divisors is an integer number (31359328).

Almost surely, 2^213405812 is an apocalyptic number.

It is an amenable number.

213405812 is a deficient number, since it is larger than the sum of its proper divisors (162906124).

213405812 is a wasteful number, since it uses less digits than its factorization.

213405812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407398 (or 407396 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 213405812 is about 14608.4157936444. The cubic root of 213405812 is about 597.5882931793.

The spelling of 213405812 in words is "two hundred thirteen million, four hundred five thousand, eight hundred twelve".