39901986 has 12 divisors (see below), whose sum is σ = 86454342. Its totient is φ = 13300656.

The previous prime is 39901963. The next prime is 39901997. The reversal of 39901986 is 68910993.

It can be written as a sum of positive squares in only one way, i.e., 36905625 + 2996361 = 6075^2 + 1731^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1108371 + ... + 1108406.

Almost surely, 2^39901986 is an apocalyptic number.

39901986 is an abundant number, since it is smaller than the sum of its proper divisors (46552356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39901986 is a wasteful number, since it uses less digits than its factorization.

39901986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216785 (or 2216782 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 39901986 is about 6316.8018806988. The cubic root of 39901986 is about 341.7156248965.

The spelling of 39901986 in words is "thirty-nine million, nine hundred one thousand, nine hundred eighty-six".