39979961 has 8 divisors (see below), whose sum is σ = 46806144. Its totient is φ = 33432480.

The previous prime is 39979897. The next prime is 39979963. The reversal of 39979961 is 16997993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39979961 - 2⁶ = 39979897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39979963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69365 + ... + 69938.

It is an arithmetic number, because the mean of its divisors is an integer number (5850768).

Almost surely, 2^39979961 is an apocalyptic number.

It is an amenable number.

39979961 is a deficient number, since it is larger than the sum of its proper divisors (6826183).

39979961 is a wasteful number, since it uses less digits than its factorization.

39979961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139351.

The product of its digits is 826686, while the sum is 53.

The square root of 39979961 is about 6322.9708998223. The cubic root of 39979961 is about 341.9380694491.

The spelling of 39979961 in words is "thirty-nine million, nine hundred seventy-nine thousand, nine hundred sixty-one".