7958921 has 2 divisors, whose sum is σ = 7958922. Its totient is φ = 7958920.

The previous prime is 7958917. The next prime is 7958927. The reversal of 7958921 is 1298597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7639696 + 319225 = 2764^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 7958921 - 2² = 7958917 is a prime.

It is not a weakly prime, because it can be changed into another prime (7958927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3979460 + 3979461.

It is an arithmetic number, because the mean of its divisors is an integer number (3979461).

Almost surely, 2^7958921 is an apocalyptic number.

It is an amenable number.

7958921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7958921 is an equidigital number, since it uses as much as digits as its factorization.

7958921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 7958921 is about 2821.1559687476. The cubic root of 7958921 is about 199.6570873907.

The spelling of 7958921 in words is "seven million, nine hundred fifty-eight thousand, nine hundred twenty-one".