8139644 has 12 divisors (see below), whose sum is σ = 14416584. Its totient is φ = 4020624.

The previous prime is 8139641. The next prime is 8139661. The reversal of 8139644 is 4469318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11927 + ... + 12590.

It is an arithmetic number, because the mean of its divisors is an integer number (1201382).

Almost surely, 2^8139644 is an apocalyptic number.

It is an amenable number.

8139644 is a deficient number, since it is larger than the sum of its proper divisors (6276940).

8139644 is a wasteful number, since it uses less digits than its factorization.

8139644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24604 (or 24602 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 8139644 is about 2853.0061338876. The cubic root of 8139644 is about 201.1569939188.

Subtracting from 8139644 its sum of digits (35), we obtain a square (8139609 = 2853²).

The spelling of 8139644 in words is "eight million, one hundred thirty-nine thousand, six hundred forty-four".