39397872 has 20 divisors (see below), whose sum is σ = 101777960. Its totient is φ = 13132608.

The previous prime is 39397871. The next prime is 39397877. The reversal of 39397872 is 27879393.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 820789 = 39397872 / (3 + 9 + 3 + 9 + 7 + 8 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39397871) 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, 410347 + ... + 410442.

It is an arithmetic number, because the mean of its divisors is an integer number (5088898).

Almost surely, 2^39397872 is an apocalyptic number.

It is an amenable number.

39397872 is an abundant number, since it is smaller than the sum of its proper divisors (62380088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39397872 is a wasteful number, since it uses less digits than its factorization.

39397872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820800 (or 820794 counting only the distinct ones).

The product of its digits is 571536, while the sum is 48.

The square root of 39397872 is about 6276.7724190064. The cubic root of 39397872 is about 340.2704652990.

It can be divided in two parts, 3939 and 7872, that added together give a palindrome (11811).

The spelling of 39397872 in words is "thirty-nine million, three hundred ninety-seven thousand, eight hundred seventy-two".