38385721 has 8 divisors (see below), whose sum is σ = 41976000. Its totient is φ = 34812240.

The previous prime is 38385709. The next prime is 38385733. The reversal of 38385721 is 12758383.

It is an interprime number because it is at equal distance from previous prime (38385709) and next prime (38385733).

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 38385721 - 2⁷ = 38385593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38385701) 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, 855 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (5247000).

Almost surely, 2^38385721 is an apocalyptic number.

It is an amenable number.

38385721 is a deficient number, since it is larger than the sum of its proper divisors (3590279).

38385721 is a wasteful number, since it uses less digits than its factorization.

38385721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8399.

The product of its digits is 40320, while the sum is 37.

The square root of 38385721 is about 6195.6211149488. The cubic root of 38385721 is about 337.3312436620.

It can be divided in two parts, 3838 and 5721, that added together give a palindrome (9559).

The spelling of 38385721 in words is "thirty-eight million, three hundred eighty-five thousand, seven hundred twenty-one".