139395639 has 8 divisors (see below), whose sum is σ = 185915520. Its totient is φ = 92903096.

The previous prime is 139395593. The next prime is 139395653. The reversal of 139395639 is 936593931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139395639 - 2⁸ = 139395383 is a prime.

It is a super-2 number, since 2×139395639² = 38862288344436642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139395679) 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, 15424 + ... + 22730.

It is an arithmetic number, because the mean of its divisors is an integer number (23239440).

Almost surely, 2^139395639 is an apocalyptic number.

139395639 is a deficient number, since it is larger than the sum of its proper divisors (46519881).

139395639 is an equidigital number, since it uses as much as digits as its factorization.

139395639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13669.

The product of its digits is 590490, while the sum is 48.

The square root of 139395639 is about 11806.5930310145. The cubic root of 139395639 is about 518.5011560347.

The spelling of 139395639 in words is "one hundred thirty-nine million, three hundred ninety-five thousand, six hundred thirty-nine".