39961816 has 8 divisors (see below), whose sum is σ = 74928420. Its totient is φ = 19980904.

The previous prime is 39961783. The next prime is 39961829. The reversal of 39961816 is 61816993.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent 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 as a sum of consecutive naturals, namely, 2497606 + ... + 2497621.

Almost surely, 2^39961816 is an apocalyptic number.

It is an amenable number.

39961816 is a deficient number, since it is larger than the sum of its proper divisors (34966604).

39961816 is a wasteful number, since it uses less digits than its factorization.

39961816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995233 (or 4995229 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The square root of 39961816 is about 6321.5358893231. The cubic root of 39961816 is about 341.8863318203.

The spelling of 39961816 in words is "thirty-nine million, nine hundred sixty-one thousand, eight hundred sixteen".