39972428 has 12 divisors (see below), whose sum is σ = 73633560. Its totient is φ = 18934272.

The previous prime is 39972421. The next prime is 39972431. The reversal of 39972428 is 82427993.

39972428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (39972421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262901 + ... + 263052.

It is an arithmetic number, because the mean of its divisors is an integer number (6136130).

Almost surely, 2^39972428 is an apocalyptic number.

39972428 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

39972428 is a deficient number, since it is larger than the sum of its proper divisors (33661132).

39972428 is a wasteful number, since it uses less digits than its factorization.

39972428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525976 (or 525974 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 39972428 is about 6322.3751865893. The cubic root of 39972428 is about 341.9165921789.

It can be divided in two parts, 399 and 72428, that added together give a palindrome (72827).

The spelling of 39972428 in words is "thirty-nine million, nine hundred seventy-two thousand, four hundred twenty-eight".