39928139 has 4 divisors (see below), whose sum is σ = 42029640. Its totient is φ = 37826640.

The previous prime is 39928129. The next prime is 39928193. The reversal of 39928139 is 93182993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39928139 - 2¹² = 39924043 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 39928139.

It is not an unprimeable number, because it can be changed into a prime (39928129) 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, 1050722 + ... + 1050759.

It is an arithmetic number, because the mean of its divisors is an integer number (10507410).

Almost surely, 2^39928139 is an apocalyptic number.

39928139 is a deficient number, since it is larger than the sum of its proper divisors (2101501).

39928139 is a wasteful number, since it uses less digits than its factorization.

39928139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101500.

The product of its digits is 104976, while the sum is 44.

The square root of 39928139 is about 6318.8716556043. The cubic root of 39928139 is about 341.7902656003.

The spelling of 39928139 in words is "thirty-nine million, nine hundred twenty-eight thousand, one hundred thirty-nine".