39938991 has 8 divisors (see below), whose sum is σ = 54002304. Its totient is φ = 26250840.

The previous prime is 39938981. The next prime is 39938993. The reversal of 39938991 is 19983993.

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

It is not a de Polignac number, because 39938991 - 2¹⁰ = 39937967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39938993) 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, 93541 + ... + 93966.

It is an arithmetic number, because the mean of its divisors is an integer number (6750288).

Almost surely, 2^39938991 is an apocalyptic number.

39938991 is a deficient number, since it is larger than the sum of its proper divisors (14063313).

39938991 is a wasteful number, since it uses less digits than its factorization.

39938991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187581.

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

The square root of 39938991 is about 6319.7302948781. The cubic root of 39938991 is about 341.8212276576.

The spelling of 39938991 in words is "thirty-nine million, nine hundred thirty-eight thousand, nine hundred ninety-one".