8138021 has 8 divisors (see below), whose sum is σ = 8620224. Its totient is φ = 7666560.

The previous prime is 8137999. The next prime is 8138063. The reversal of 8138021 is 1208318.

8138021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8138021 - 2⁶ = 8137957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8137021) 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, 1100 + ... + 4181.

It is an arithmetic number, because the mean of its divisors is an integer number (1077528).

Almost surely, 2^8138021 is an apocalyptic number.

It is an amenable number.

8138021 is a deficient number, since it is larger than the sum of its proper divisors (482203).

8138021 is a wasteful number, since it uses less digits than its factorization.

8138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 8138021 is about 2852.7216828846. The cubic root of 8138021 is about 201.1436231660.

The spelling of 8138021 in words is "eight million, one hundred thirty-eight thousand, twenty-one".