39939891 has 8 divisors (see below), whose sum is σ = 55568640. Its totient is φ = 25468872.

The previous prime is 39939877. The next prime is 39939917. The reversal of 39939891 is 19893993.

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

It is not a de Polignac number, because 39939891 - 2⁵ = 39939859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39939821) 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, 289351 + ... + 289488.

It is an arithmetic number, because the mean of its divisors is an integer number (6946080).

Almost surely, 2^39939891 is an apocalyptic number.

39939891 is a deficient number, since it is larger than the sum of its proper divisors (15628749).

39939891 is a wasteful number, since it uses less digits than its factorization.

39939891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578865.

The product of its digits is 472392, while the sum is 51.

The square root of 39939891 is about 6319.8015000473. The cubic root of 39939891 is about 341.8237952136.

The spelling of 39939891 in words is "thirty-nine million, nine hundred thirty-nine thousand, eight hundred ninety-one".