213905992 has 8 divisors (see below), whose sum is σ = 401073750. Its totient is φ = 106952992.

The previous prime is 213905969. The next prime is 213905999. The reversal of 213905992 is 299509312.

It can be written as a sum of positive squares in only one way, i.e., 210424036 + 3481956 = 14506^2 + 1866^2 .

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

It is not an unprimeable number, because it can be changed into a prime (213905999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13369117 + ... + 13369132.

Almost surely, 2^213905992 is an apocalyptic number.

It is an amenable number.

213905992 is a deficient number, since it is larger than the sum of its proper divisors (187167758).

213905992 is a wasteful number, since it uses less digits than its factorization.

213905992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26738255 (or 26738251 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 213905992 is about 14625.5253580854. The cubic root of 213905992 is about 598.0548042076.

The spelling of 213905992 in words is "two hundred thirteen million, nine hundred five thousand, nine hundred ninety-two".