213903657 has 24 divisors (see below), whose sum is σ = 351718848. Its totient is φ = 124000800.

The previous prime is 213903643. The next prime is 213903661. The reversal of 213903657 is 756309312.

It is not a de Polignac number, because 213903657 - 2¹² = 213899561 is a prime.

It is a hoax number, since the sum of its digits (36) 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 (213903667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44694 + ... + 49247.

It is an arithmetic number, because the mean of its divisors is an integer number (14654952).

Almost surely, 2^213903657 is an apocalyptic number.

It is an amenable number.

213903657 is a deficient number, since it is larger than the sum of its proper divisors (137815191).

213903657 is a wasteful number, since it uses less digits than its factorization.

213903657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93981 (or 93978 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 213903657 is about 14625.4455316753. The cubic root of 213903657 is about 598.0526280755.

The spelling of 213903657 in words is "two hundred thirteen million, nine hundred three thousand, six hundred fifty-seven".