39981535 has 32 divisors (see below), whose sum is σ = 56407104. Its totient is φ = 26880000.

The previous prime is 39981509. The next prime is 39981551. The reversal of 39981535 is 53518993.

39981535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39981535 - 2⁵ = 39981503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39981491 and 39981500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56685 + ... + 57385.

It is an arithmetic number, because the mean of its divisors is an integer number (1762722).

Almost surely, 2^39981535 is an apocalyptic number.

39981535 is a deficient number, since it is larger than the sum of its proper divisors (16425569).

39981535 is a wasteful number, since it uses less digits than its factorization.

39981535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795.

The product of its digits is 145800, while the sum is 43.

The square root of 39981535 is about 6323.0953654045. The cubic root of 39981535 is about 341.9425567259.

The spelling of 39981535 in words is "thirty-nine million, nine hundred eighty-one thousand, five hundred thirty-five".