7921943 has 2 divisors, whose sum is σ = 7921944. Its totient is φ = 7921942.

The previous prime is 7921931. The next prime is 7921981. The reversal of 7921943 is 3491297.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7921943 - 2⁸ = 7921687 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7926943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960971 + 3960972.

It is an arithmetic number, because the mean of its divisors is an integer number (3960972).

Almost surely, 2^7921943 is an apocalyptic number.

7921943 is a deficient number, since it is larger than the sum of its proper divisors (1).

7921943 is an equidigital number, since it uses as much as digits as its factorization.

7921943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 7921943 is about 2814.5946422176. The cubic root of 7921943 is about 199.3473978684.

It can be divided in two parts, 79 and 21943, that added together give a palindrome (22022).

The spelling of 7921943 in words is "seven million, nine hundred twenty-one thousand, nine hundred forty-three".