39979537 has 8 divisors (see below), whose sum is σ = 43482600. Its totient is φ = 36537600.

The previous prime is 39979517. The next prime is 39979559. The reversal of 39979537 is 73597993.

It can be written as a sum of positive squares in 4 ways, for example, as 2903616 + 37075921 = 1704^2 + 6089^2 .

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 39979537 - 2²³ = 31590929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39979517) 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, 13912 + ... + 16537.

It is an arithmetic number, because the mean of its divisors is an integer number (5435325).

Almost surely, 2^39979537 is an apocalyptic number.

It is an amenable number.

39979537 is a deficient number, since it is larger than the sum of its proper divisors (3503063).

39979537 is a wasteful number, since it uses less digits than its factorization.

39979537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30563.

The product of its digits is 1607445, while the sum is 52.

The square root of 39979537 is about 6322.9373711907. The cubic root of 39979537 is about 341.9368606580.

The spelling of 39979537 in words is "thirty-nine million, nine hundred seventy-nine thousand, five hundred thirty-seven".