38921521 has 8 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 37636848.

The previous prime is 38921513. The next prime is 38921549. The reversal of 38921521 is 12512983.

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 38921521 - 2³ = 38921513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38921621) 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, 3030 + ... + 9328.

It is an arithmetic number, because the mean of its divisors is an integer number (5027400).

Almost surely, 2^38921521 is an apocalyptic number.

It is an amenable number.

38921521 is a deficient number, since it is larger than the sum of its proper divisors (1297679).

38921521 is a wasteful number, since it uses less digits than its factorization.

38921521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6503.

The product of its digits is 4320, while the sum is 31.

The square root of 38921521 is about 6238.7114855553. The cubic root of 38921521 is about 338.8935224226.

The spelling of 38921521 in words is "thirty-eight million, nine hundred twenty-one thousand, five hundred twenty-one".