39739021 has 4 divisors (see below), whose sum is σ = 45416032. Its totient is φ = 34062012.

The previous prime is 39738997. The next prime is 39739027. The reversal of 39739021 is 12093793.

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: 12093793 = 43 ⋅281251.

It is a cyclic number.

It is not a de Polignac number, because 39739021 - 2¹³ = 39730829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39739027) 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, 2838495 + ... + 2838508.

It is an arithmetic number, because the mean of its divisors is an integer number (11354008).

Almost surely, 2^39739021 is an apocalyptic number.

It is an amenable number.

39739021 is a deficient number, since it is larger than the sum of its proper divisors (5677011).

39739021 is an equidigital number, since it uses as much as digits as its factorization.

39739021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5677010.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 39739021 is about 6303.8893549935. The cubic root of 39739021 is about 341.2497861681.

The spelling of 39739021 in words is "thirty-nine million, seven hundred thirty-nine thousand, twenty-one".