213948657 has 24 divisors (see below), whose sum is σ = 333517184. Its totient is φ = 131380704.

The previous prime is 213948649. The next prime is 213948667. The reversal of 213948657 is 756849312.

It is not a de Polignac number, because 213948657 - 2³ = 213948649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213948667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62328 + ... + 65670.

Almost surely, 2^213948657 is an apocalyptic number.

It is an amenable number.

213948657 is a deficient number, since it is larger than the sum of its proper divisors (119568527).

213948657 is a wasteful number, since it uses less digits than its factorization.

213948657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909 (or 3906 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213948657 is about 14626.9838654454. The cubic root of 213948657 is about 598.0945635924.

The spelling of 213948657 in words is "two hundred thirteen million, nine hundred forty-eight thousand, six hundred fifty-seven".