7855399 has 2 divisors, whose sum is σ = 7855400. Its totient is φ = 7855398.

The previous prime is 7855381. The next prime is 7855403. The reversal of 7855399 is 9935587.

7855399 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (9935587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7855399 - 2⁷ = 7855271 is a prime.

It is a Chen prime.

7855399 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7855339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927699 + 3927700.

It is an arithmetic number, because the mean of its divisors is an integer number (3927700).

Almost surely, 2^7855399 is an apocalyptic number.

7855399 is a deficient number, since it is larger than the sum of its proper divisors (1).

7855399 is an equidigital number, since it uses as much as digits as its factorization.

7855399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The square root of 7855399 is about 2802.7484724820. The cubic root of 7855399 is about 198.7876576457.

The spelling of 7855399 in words is "seven million, eight hundred fifty-five thousand, three hundred ninety-nine".