39139997 has 16 divisors (see below), whose sum is σ = 44567040. Its totient is φ = 34100352.

The previous prime is 39139927. The next prime is 39140027. The reversal of 39139997 is 79993193.

It is a happy number.

It is not a de Polignac number, because 39139997 - 2⁸ = 39139741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39139907) 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, 22793 + ... + 24449.

It is an arithmetic number, because the mean of its divisors is an integer number (2785440).

Almost surely, 2^39139997 is an apocalyptic number.

It is an amenable number.

39139997 is a deficient number, since it is larger than the sum of its proper divisors (5427043).

39139997 is a wasteful number, since it uses less digits than its factorization.

39139997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772.

The product of its digits is 413343, while the sum is 50.

The square root of 39139997 is about 6256.1966880845. The cubic root of 39139997 is about 339.5264370215.

The spelling of 39139997 in words is "thirty-nine million, one hundred thirty-nine thousand, nine hundred ninety-seven".