38133721 has 4 divisors (see below), whose sum is σ = 38161872. Its totient is φ = 38105572.

The previous prime is 38133713. The next prime is 38133743. The reversal of 38133721 is 12733183.

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.

It is a cyclic number.

It is not a de Polignac number, because 38133721 - 2³ = 38133713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38133721.

It is not an unprimeable number, because it can be changed into a prime (38133761) 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, 11935 + ... + 14788.

It is an arithmetic number, because the mean of its divisors is an integer number (9540468).

Almost surely, 2^38133721 is an apocalyptic number.

It is an amenable number.

38133721 is a deficient number, since it is larger than the sum of its proper divisors (28151).

38133721 is a wasteful number, since it uses less digits than its factorization.

38133721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28150.

The product of its digits is 3024, while the sum is 28.

The square root of 38133721 is about 6175.2506831707. The cubic root of 38133721 is about 336.5914357712.

The spelling of 38133721 in words is "thirty-eight million, one hundred thirty-three thousand, seven hundred twenty-one".