7958399 has 2 divisors, whose sum is σ = 7958400. Its totient is φ = 7958398.

The previous prime is 7958371. The next prime is 7958407. The reversal of 7958399 is 9938597.

It is a strong prime.

It is an emirp because it is prime and its reverse (9938597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7958399 - 2⁸ = 7958143 is a prime.

It is a super-2 number, since 2×7958399² = 126672229286402, which contains 22 as substring.

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 (7958309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3979199 + 3979200.

It is an arithmetic number, because the mean of its divisors is an integer number (3979200).

Almost surely, 2^7958399 is an apocalyptic number.

7958399 is a deficient number, since it is larger than the sum of its proper divisors (1).

7958399 is an equidigital number, since it uses as much as digits as its factorization.

7958399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 50.

The square root of 7958399 is about 2821.0634519628. The cubic root of 7958399 is about 199.6527223402.

The spelling of 7958399 in words is "seven million, nine hundred fifty-eight thousand, three hundred ninety-nine".