38329721 has 4 divisors (see below), whose sum is σ = 38352000. Its totient is φ = 38307444.

The previous prime is 38329717. The next prime is 38329729. The reversal of 38329721 is 12792383.

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: 12792383 = 307 ⋅41669.

It is a cyclic number.

It is not a de Polignac number, because 38329721 - 2² = 38329717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38329729) 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, 8321 + ... + 12078.

It is an arithmetic number, because the mean of its divisors is an integer number (9588000).

Almost surely, 2^38329721 is an apocalyptic number.

It is an amenable number.

38329721 is a deficient number, since it is larger than the sum of its proper divisors (22279).

38329721 is a wasteful number, since it uses less digits than its factorization.

38329721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22278.

The product of its digits is 18144, while the sum is 35.

The square root of 38329721 is about 6191.1001445624. The cubic root of 38329721 is about 337.1671223609.

The spelling of 38329721 in words is "thirty-eight million, three hundred twenty-nine thousand, seven hundred twenty-one".