65321399 has 16 divisors (see below), whose sum is σ = 78382080. Its totient is φ = 53643360.

The previous prime is 65321393. The next prime is 65321401. The reversal of 65321399 is 99312356.

It is a cyclic number.

It is not a de Polignac number, because 65321399 - 2⁸ = 65321143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65321393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1862 + ... + 11580.

It is an arithmetic number, because the mean of its divisors is an integer number (4898880).

Almost surely, 2^65321399 is an apocalyptic number.

65321399 is a deficient number, since it is larger than the sum of its proper divisors (13060681).

65321399 is a wasteful number, since it uses less digits than its factorization.

65321399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9790.

The product of its digits is 43740, while the sum is 38.

The square root of 65321399 is about 8082.1654895207. The cubic root of 65321399 is about 402.7341826134.

The spelling of 65321399 in words is "sixty-five million, three hundred twenty-one thousand, three hundred ninety-nine".