647397393 has 8 divisors (see below), whose sum is σ = 908628000. Its totient is φ = 408882528.

The previous prime is 647397391. The next prime is 647397409. The reversal of 647397393 is 393793746.

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

It is not a de Polignac number, because 647397393 - 2¹ = 647397391 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (647397391) 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, 5678868 + ... + 5678981.

It is an arithmetic number, because the mean of its divisors is an integer number (113578500).

Almost surely, 2^647397393 is an apocalyptic number.

It is an amenable number.

647397393 is a deficient number, since it is larger than the sum of its proper divisors (261230607).

647397393 is a wasteful number, since it uses less digits than its factorization.

647397393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11357871.

The product of its digits is 2571912, while the sum is 51.

The square root of 647397393 is about 25444.0050503061. The cubic root of 647397393 is about 865.0814152600.

The spelling of 647397393 in words is "six hundred forty-seven million, three hundred ninety-seven thousand, three hundred ninety-three".