6138639 has 16 divisors (see below), whose sum is σ = 9794400. Its totient is φ = 3777408.

The previous prime is 6138611. The next prime is 6138647. The reversal of 6138639 is 9368316.

It is a happy number.

6138639 is a `hidden beast` number, since 6 + 13 + 8 + 639 = 666.

It is not a de Polignac number, because 6138639 - 2⁸ = 6138383 is a prime.

It is a super-3 number, since 3×6138639³ (a number of 21 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6138659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8394 + ... + 9095.

It is an arithmetic number, because the mean of its divisors is an integer number (612150).

Almost surely, 2^6138639 is an apocalyptic number.

6138639 is a deficient number, since it is larger than the sum of its proper divisors (3655761).

6138639 is a wasteful number, since it uses less digits than its factorization.

6138639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17511 (or 17505 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 6138639 is about 2477.6276960028. The cubic root of 6138639 is about 183.1009923604.

It can be divided in two parts, 61386 and 39, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 6138639 in words is "six million, one hundred thirty-eight thousand, six hundred thirty-nine".