39928138 has 16 divisors (see below), whose sum is σ = 66173760. Its totient is φ = 17972416.

The previous prime is 39928129. The next prime is 39928193. The reversal of 39928138 is 83182993.

It is a happy number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 39928094 and 39928103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24748 + ... + 26311.

It is an arithmetic number, because the mean of its divisors is an integer number (4135860).

Almost surely, 2^39928138 is an apocalyptic number.

39928138 is a deficient number, since it is larger than the sum of its proper divisors (26245622).

39928138 is a wasteful number, since it uses less digits than its factorization.

39928138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51101.

The product of its digits is 93312, while the sum is 43.

The square root of 39928138 is about 6318.8715764763. The cubic root of 39928138 is about 341.7902627469.

The spelling of 39928138 in words is "thirty-nine million, nine hundred twenty-eight thousand, one hundred thirty-eight".