39913621 has 8 divisors (see below), whose sum is σ = 44067744. Its totient is φ = 35847120.

The previous prime is 39913619. The next prime is 39913631. The reversal of 39913621 is 12631993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39913621 - 2¹ = 39913619 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 (39913631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20946 + ... + 22771.

It is an arithmetic number, because the mean of its divisors is an integer number (5508468).

Almost surely, 2^39913621 is an apocalyptic number.

It is an amenable number.

39913621 is a deficient number, since it is larger than the sum of its proper divisors (4154123).

39913621 is a wasteful number, since it uses less digits than its factorization.

39913621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43811.

The product of its digits is 8748, while the sum is 34.

The square root of 39913621 is about 6317.7227701127. The cubic root of 39913621 is about 341.7488352311.

The spelling of 39913621 in words is "thirty-nine million, nine hundred thirteen thousand, six hundred twenty-one".