39939919 has 8 divisors (see below), whose sum is σ = 44515440. Its totient is φ = 35611776.

The previous prime is 39939917. The next prime is 39939929. The reversal of 39939919 is 91993993.

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

It is not a de Polignac number, because 39939919 - 2¹ = 39939917 is a prime.

It is a super-2 number, since 2×39939919² = 3190394259453122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39939917) 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, 61504 + ... + 62149.

It is an arithmetic number, because the mean of its divisors is an integer number (5564430).

Almost surely, 2^39939919 is an apocalyptic number.

39939919 is a deficient number, since it is larger than the sum of its proper divisors (4575521).

39939919 is a wasteful number, since it uses less digits than its factorization.

39939919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123689.

The product of its digits is 531441, while the sum is 52.

The square root of 39939919 is about 6319.8037153064. The cubic root of 39939919 is about 341.8238750925.

The spelling of 39939919 in words is "thirty-nine million, nine hundred thirty-nine thousand, nine hundred nineteen".