38668821 has 4 divisors (see below), whose sum is σ = 51558432. Its totient is φ = 25779212.

The previous prime is 38668793. The next prime is 38668843. The reversal of 38668821 is 12886683.

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 38668821 - 2¹⁴ = 38652437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38668871) 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, 6444801 + ... + 6444806.

It is an arithmetic number, because the mean of its divisors is an integer number (12889608).

Almost surely, 2^38668821 is an apocalyptic number.

It is an amenable number.

38668821 is a deficient number, since it is larger than the sum of its proper divisors (12889611).

38668821 is a wasteful number, since it uses less digits than its factorization.

38668821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12889610.

The product of its digits is 110592, while the sum is 42.

The square root of 38668821 is about 6218.4259262292. The cubic root of 38668821 is about 338.1585014577.

The spelling of 38668821 in words is "thirty-eight million, six hundred sixty-eight thousand, eight hundred twenty-one".