39972309 has 8 divisors (see below), whose sum is σ = 57396192. Its totient is φ = 24598320.

The previous prime is 39972301. The next prime is 39972319. The reversal of 39972309 is 90327993.

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

It is not a de Polignac number, because 39972309 - 2³ = 39972301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972301) 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, 512427 + ... + 512504.

It is an arithmetic number, because the mean of its divisors is an integer number (7174524).

Almost surely, 2^39972309 is an apocalyptic number.

39972309 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

39972309 is a deficient number, since it is larger than the sum of its proper divisors (17423883).

39972309 is a wasteful number, since it uses less digits than its factorization.

39972309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024947.

The product of its (nonzero) digits is 91854, while the sum is 42.

The square root of 39972309 is about 6322.3657755622. The cubic root of 39972309 is about 341.9162528774.

The spelling of 39972309 in words is "thirty-nine million, nine hundred seventy-two thousand, three hundred nine".