39716021 has 4 divisors (see below), whose sum is σ = 39732000. Its totient is φ = 39700044.

The previous prime is 39716011. The next prime is 39716057. The reversal of 39716021 is 12061793.

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: 12061793 = 53 ⋅227581.

It is a cyclic number.

It is not a de Polignac number, because 39716021 - 2⁶ = 39715957 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 (39716011) 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, 3371 + ... + 9528.

It is an arithmetic number, because the mean of its divisors is an integer number (9933000).

Almost surely, 2^39716021 is an apocalyptic number.

It is an amenable number.

39716021 is a deficient number, since it is larger than the sum of its proper divisors (15979).

39716021 is a wasteful number, since it uses less digits than its factorization.

39716021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 39716021 is about 6302.0648203585. The cubic root of 39716021 is about 341.1839377099.

The spelling of 39716021 in words is "thirty-nine million, seven hundred sixteen thousand, twenty-one".