766399 has 2 divisors, whose sum is σ = 766400. Its totient is φ = 766398.

The previous prime is 766393. The next prime is 766421. The reversal of 766399 is 993667.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-766399 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383199 + 383200.

It is an arithmetic number, because the mean of its divisors is an integer number (383200).

2⁷⁶⁶³⁹⁹ is an apocalyptic number.

766399 is a deficient number, since it is larger than the sum of its proper divisors (1).

766399 is an equidigital number, since it uses as much as digits as its factorization.

766399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 40.

The square root of 766399 is about 875.4421739898. The cubic root of 766399 is about 91.5134601517.

The spelling of 766399 in words is "seven hundred sixty-six thousand, three hundred ninety-nine".