216386457 has 8 divisors (see below), whose sum is σ = 329731776. Its totient is φ = 123649392.

The previous prime is 216386447. The next prime is 216386491. The reversal of 216386457 is 754683612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216386457 - 2⁶ = 216386393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216386407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5152038 + ... + 5152079.

It is an arithmetic number, because the mean of its divisors is an integer number (41216472).

Almost surely, 2^216386457 is an apocalyptic number.

It is an amenable number.

216386457 is a deficient number, since it is larger than the sum of its proper divisors (113345319).

216386457 is a wasteful number, since it uses less digits than its factorization.

216386457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304127.

The product of its digits is 241920, while the sum is 42.

The square root of 216386457 is about 14710.0801153495. The cubic root of 216386457 is about 600.3576173629.

The spelling of 216386457 in words is "two hundred sixteen million, three hundred eighty-six thousand, four hundred fifty-seven".