39809939 has 8 divisors (see below), whose sum is σ = 43099392. Its totient is φ = 36552960.

The previous prime is 39809929. The next prime is 39809947. The reversal of 39809939 is 93990893.

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 39809939 - 2¹⁶ = 39744403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39809929) 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, 5534 + ... + 10499.

It is an arithmetic number, because the mean of its divisors is an integer number (5387424).

Almost surely, 2^39809939 is an apocalyptic number.

39809939 is a deficient number, since it is larger than the sum of its proper divisors (3289453).

39809939 is a wasteful number, since it uses less digits than its factorization.

39809939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16237.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 39809939 is about 6309.5117877693. The cubic root of 39809939 is about 341.4526629193.

The spelling of 39809939 in words is "thirty-nine million, eight hundred nine thousand, nine hundred thirty-nine".