39038921 has 4 divisors (see below), whose sum is σ = 39085332. Its totient is φ = 38992512.

The previous prime is 39038893. The next prime is 39038933. The reversal of 39038921 is 12983093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33582025 + 5456896 = 5795^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 39038921 - 2²² = 34844617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39038941) 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, 21920 + ... + 23633.

It is an arithmetic number, because the mean of its divisors is an integer number (9771333).

Almost surely, 2^39038921 is an apocalyptic number.

It is an amenable number.

39038921 is a deficient number, since it is larger than the sum of its proper divisors (46411).

39038921 is an equidigital number, since it uses as much as digits as its factorization.

39038921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46410.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 39038921 is about 6248.1133952578. The cubic root of 39038921 is about 339.2339181968.

The spelling of 39038921 in words is "thirty-nine million, thirty-eight thousand, nine hundred twenty-one".