764399 has 2 divisors, whose sum is σ = 764400. Its totient is φ = 764398.

The previous prime is 764381. The next prime is 764431. The reversal of 764399 is 993467.

It is a weak prime.

It is an emirp because it is prime and its reverse (993467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 764399 - 2⁸ = 764143 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 (764339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382199 + 382200.

It is an arithmetic number, because the mean of its divisors is an integer number (382200).

2⁷⁶⁴³⁹⁹ is an apocalyptic number.

764399 is a deficient number, since it is larger than the sum of its proper divisors (1).

764399 is an equidigital number, since it uses as much as digits as its factorization.

764399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 764399 is about 874.2991478893. The cubic root of 764399 is about 91.4337860912.

It can be divided in two parts, 7643 and 99, that multiplied together give a palindrome (756657).

The spelling of 764399 in words is "seven hundred sixty-four thousand, three hundred ninety-nine".