39975321 has 4 divisors (see below), whose sum is σ = 53300432. Its totient is φ = 26650212.

The previous prime is 39975317. The next prime is 39975361. The reversal of 39975321 is 12357993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12357993 = 3 ⋅4119331.

It is not a de Polignac number, because 39975321 - 2² = 39975317 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 39975321.

It is not an unprimeable number, because it can be changed into a prime (39975301) 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, 6662551 + ... + 6662556.

It is an arithmetic number, because the mean of its divisors is an integer number (13325108).

Almost surely, 2^39975321 is an apocalyptic number.

It is an amenable number.

39975321 is a deficient number, since it is larger than the sum of its proper divisors (13325111).

39975321 is a wasteful number, since it uses less digits than its factorization.

39975321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13325110.

The product of its digits is 51030, while the sum is 39.

The square root of 39975321 is about 6322.6039730478. The cubic root of 39975321 is about 341.9248407049.

The spelling of 39975321 in words is "thirty-nine million, nine hundred seventy-five thousand, three hundred twenty-one".