39393521 has 8 divisors (see below), whose sum is σ = 40090080. Its totient is φ = 38700288.

The previous prime is 39393511. The next prime is 39393551. The reversal of 39393521 is 12539393.

It is a happy number.

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 39393521 - 2¹⁰ = 39392497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39393511) 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, 38150 + ... + 39168.

It is an arithmetic number, because the mean of its divisors is an integer number (5011260).

Almost surely, 2^39393521 is an apocalyptic number.

It is an amenable number.

39393521 is a deficient number, since it is larger than the sum of its proper divisors (696559).

39393521 is a wasteful number, since it uses less digits than its factorization.

39393521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663.

The product of its digits is 21870, while the sum is 35.

The square root of 39393521 is about 6276.4258141079. The cubic root of 39393521 is about 340.2579386386.

The spelling of 39393521 in words is "thirty-nine million, three hundred ninety-three thousand, five hundred twenty-one".