39972599 has 4 divisors (see below), whose sum is σ = 42076440. Its totient is φ = 37868760.

The previous prime is 39972577. The next prime is 39972601. The reversal of 39972599 is 99527993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99527993 = 1777 ⋅56009.

It is a cyclic number.

It is not a de Polignac number, because 39972599 - 2²⁰ = 38924023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39972599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051892 + ... + 1051929.

It is an arithmetic number, because the mean of its divisors is an integer number (10519110).

Almost surely, 2^39972599 is an apocalyptic number.

39972599 is a deficient number, since it is larger than the sum of its proper divisors (2103841).

39972599 is a wasteful number, since it uses less digits than its factorization.

39972599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103840.

The product of its digits is 1377810, while the sum is 53.

The square root of 39972599 is about 6322.3887099735. The cubic root of 39972599 is about 341.9170797454.

The spelling of 39972599 in words is "thirty-nine million, nine hundred seventy-two thousand, five hundred ninety-nine".