656381438 has 4 divisors (see below), whose sum is σ = 984572160. Its totient is φ = 328190718.

The previous prime is 656381419. The next prime is 656381483. The reversal of 656381438 is 834183656.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164095358 + ... + 164095361.

It is an arithmetic number, because the mean of its divisors is an integer number (246143040).

Almost surely, 2^656381438 is an apocalyptic number.

656381438 is a deficient number, since it is larger than the sum of its proper divisors (328190722).

656381438 is a wasteful number, since it uses less digits than its factorization.

656381438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328190721.

The product of its digits is 414720, while the sum is 44.

The square root of 656381438 is about 25619.9421935335. The cubic root of 656381438 is about 869.0646741094.

It can be divided in two parts, 65638 and 1438, that added together give a palindrome (67076).

The spelling of 656381438 in words is "six hundred fifty-six million, three hundred eighty-one thousand, four hundred thirty-eight".