23139639 has 6 divisors (see below), whose sum is σ = 33423936. Its totient is φ = 15426420.

The previous prime is 23139629. The next prime is 23139647. The reversal of 23139639 is 93693132.

It is a happy number.

23139639 is a `hidden beast` number, since 2 + 3 + 13 + 9 + 639 = 666.

It is not a de Polignac number, because 23139639 - 2⁵ = 23139607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23139629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1285527 + ... + 1285544.

It is an arithmetic number, because the mean of its divisors is an integer number (5570656).

Almost surely, 2^23139639 is an apocalyptic number.

23139639 is a deficient number, since it is larger than the sum of its proper divisors (10284297).

23139639 is a wasteful number, since it uses less digits than its factorization.

23139639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571077 (or 2571074 counting only the distinct ones).

The product of its digits is 26244, while the sum is 36.

The square root of 23139639 is about 4810.3678653508. The cubic root of 23139639 is about 284.9610657802.

The spelling of 23139639 in words is "twenty-three million, one hundred thirty-nine thousand, six hundred thirty-nine".