39972399 has 4 divisors (see below), whose sum is σ = 53296536. Its totient is φ = 26648264.

The previous prime is 39972377. The next prime is 39972403. The reversal of 39972399 is 99327993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39972399 - 2⁷ = 39972271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6662064 + ... + 6662069.

It is an arithmetic number, because the mean of its divisors is an integer number (13324134).

Almost surely, 2^39972399 is an apocalyptic number.

39972399 is a deficient number, since it is larger than the sum of its proper divisors (13324137).

39972399 is a wasteful number, since it uses less digits than its factorization.

39972399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13324136.

The product of its digits is 826686, while the sum is 51.

The square root of 39972399 is about 6322.3728931470. The cubic root of 39972399 is about 341.9165094920.

The spelling of 39972399 in words is "thirty-nine million, nine hundred seventy-two thousand, three hundred ninety-nine".