3856722638 has 16 divisors (see below), whose sum is σ = 6095199120. Its totient is φ = 1825177536.

The previous prime is 3856722637. The next prime is 3856722643. The reversal of 3856722638 is 8362276583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856722631) 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, 4895 + ... + 87962.

It is an arithmetic number, because the mean of its divisors is an integer number (380949945).

Almost surely, 2^3856722638 is an apocalyptic number.

3856722638 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

3856722638 is a deficient number, since it is larger than the sum of its proper divisors (2238476482).

3856722638 is a wasteful number, since it uses less digits than its factorization.

3856722638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93971.

The product of its digits is 2903040, while the sum is 50.

The square root of 3856722638 is about 62102.5171631553. The cubic root of 3856722638 is about 1568.2169214221.

The spelling of 3856722638 in words is "three billion, eight hundred fifty-six million, seven hundred twenty-two thousand, six hundred thirty-eight".