8021957 has 4 divisors (see below), whose sum is σ = 8056620. Its totient is φ = 7987296.

The previous prime is 8021941. The next prime is 8021969. The reversal of 8021957 is 7591208.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1437601 + 6584356 = 1199^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 8021957 - 2⁴ = 8021941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021257) 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, 16982 + ... + 17447.

It is an arithmetic number, because the mean of its divisors is an integer number (2014155).

Almost surely, 2^8021957 is an apocalyptic number.

It is an amenable number.

8021957 is a deficient number, since it is larger than the sum of its proper divisors (34663).

8021957 is a wasteful number, since it uses less digits than its factorization.

8021957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34662.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 8021957 is about 2832.3059509876. The cubic root of 8021957 is about 200.1828078555.

The spelling of 8021957 in words is "eight million, twenty-one thousand, nine hundred fifty-seven".