38538021 has 4 divisors (see below), whose sum is σ = 51384032. Its totient is φ = 25692012.

The previous prime is 38538001. The next prime is 38538029. The reversal of 38538021 is 12083583.

It is a happy number.

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 not a de Polignac number, because 38538021 - 2⁷ = 38537893 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 38538021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38538029) 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, 6423001 + ... + 6423006.

It is an arithmetic number, because the mean of its divisors is an integer number (12846008).

Almost surely, 2^38538021 is an apocalyptic number.

It is an amenable number.

38538021 is a deficient number, since it is larger than the sum of its proper divisors (12846011).

38538021 is a wasteful number, since it uses less digits than its factorization.

38538021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12846010.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 38538021 is about 6207.8998864350. The cubic root of 38538021 is about 337.7767891253.

The spelling of 38538021 in words is "thirty-eight million, five hundred thirty-eight thousand, twenty-one".