7943921 has 2 divisors, whose sum is σ = 7943922. Its totient is φ = 7943920.

The previous prime is 7943917. The next prime is 7943927. The reversal of 7943921 is 1293497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6864400 + 1079521 = 2620^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 7943921 - 2² = 7943917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7943927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3971960 + 3971961.

It is an arithmetic number, because the mean of its divisors is an integer number (3971961).

Almost surely, 2^7943921 is an apocalyptic number.

It is an amenable number.

7943921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7943921 is an equidigital number, since it uses as much as digits as its factorization.

7943921 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 7943921 is about 2818.4962302618. The cubic root of 7943921 is about 199.5315787642.

The spelling of 7943921 in words is "seven million, nine hundred forty-three thousand, nine hundred twenty-one".