213579904 has 16 divisors (see below), whose sum is σ = 425491470. Its totient is φ = 106789888.

The previous prime is 213579901. The next prime is 213579913. The reversal of 213579904 is 409975312.

It can be written as a sum of positive squares in only one way, i.e., 213160000 + 419904 = 14600^2 + 648^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (213579901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834169 + ... + 834424.

Almost surely, 2^213579904 is an apocalyptic number.

It is an amenable number.

213579904 is a deficient number, since it is larger than the sum of its proper divisors (211911566).

213579904 is an equidigital number, since it uses as much as digits as its factorization.

213579904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668607 (or 1668595 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 213579904 is about 14614.3731990120. The cubic root of 213579904 is about 597.7507490235.

The spelling of 213579904 in words is "two hundred thirteen million, five hundred seventy-nine thousand, nine hundred four".