217307457 has 12 divisors (see below), whose sum is σ = 316148560. Its totient is φ = 143828568.

The previous prime is 217307429. The next prime is 217307483. The reversal of 217307457 is 754703712.

It is not a de Polignac number, because 217307457 - 2⁶ = 217307393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217307407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85603 + ... + 88104.

Almost surely, 2^217307457 is an apocalyptic number.

It is an amenable number.

217307457 is a deficient number, since it is larger than the sum of its proper divisors (98841103).

217307457 is a wasteful number, since it uses less digits than its factorization.

217307457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173852 (or 173849 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The square root of 217307457 is about 14741.3519393575. The cubic root of 217307457 is about 601.2081738935.

The spelling of 217307457 in words is "two hundred seventeen million, three hundred seven thousand, four hundred fifty-seven".