64399 has 2 divisors, whose sum is σ = 64400. Its totient is φ = 64398.

The previous prime is 64381. The next prime is 64403. The reversal of 64399 is 99346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64399 - 2⁷ = 64271 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32199 + 32200.

It is an arithmetic number, because the mean of its divisors is an integer number (32200).

2⁶⁴³⁹⁹ is an apocalyptic number.

64399 is a deficient number, since it is larger than the sum of its proper divisors (1).

64399 is an equidigital number, since it uses as much as digits as its factorization.

64399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The square root of 64399 is about 253.7695805253. The cubic root of 64399 is about 40.0829528517.

The spelling of 64399 in words is "sixty-four thousand, three hundred ninety-nine".