213397904 has 10 divisors (see below), whose sum is σ = 413458470. Its totient is φ = 106698944.

The previous prime is 213397903. The next prime is 213397909. The reversal of 213397904 is 409793312.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 95023504 = 10880^2 + 9748^2 .

It is not an unprimeable number, because it can be changed into a prime (213397903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6668669 + ... + 6668700.

It is an arithmetic number, because the mean of its divisors is an integer number (41345847).

Almost surely, 2^213397904 is an apocalyptic number.

It is an amenable number.

213397904 is a deficient number, since it is larger than the sum of its proper divisors (200060566).

213397904 is a wasteful number, since it uses less digits than its factorization.

213397904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337377 (or 13337371 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 213397904 is about 14608.1451252375. The cubic root of 213397904 is about 597.5809116456.

The spelling of 213397904 in words is "two hundred thirteen million, three hundred ninety-seven thousand, nine hundred four".