656538393 has 8 divisors (see below), whose sum is σ = 1000439488. Its totient is φ = 375164784.

The previous prime is 656538373. The next prime is 656538403. The reversal of 656538393 is 393835656.

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

It is not a de Polignac number, because 656538393 - 2¹² = 656534297 is a prime.

It is a super-2 number, since 2×656538393² = 862085322966044898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656538343) 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, 15631846 + ... + 15631887.

It is an arithmetic number, because the mean of its divisors is an integer number (125054936).

Almost surely, 2^656538393 is an apocalyptic number.

It is an amenable number.

656538393 is a deficient number, since it is larger than the sum of its proper divisors (343901095).

656538393 is a wasteful number, since it uses less digits than its factorization.

656538393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31263743.

The product of its digits is 1749600, while the sum is 48.

The square root of 656538393 is about 25623.0051516211. The cubic root of 656538393 is about 869.1339393095.

The spelling of 656538393 in words is "six hundred fifty-six million, five hundred thirty-eight thousand, three hundred ninety-three".