64000399 has 4 divisors (see below), whose sum is σ = 66064960. Its totient is φ = 61935840.

The previous prime is 64000381. The next prime is 64000411. The reversal of 64000399 is 99300046.

64000399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99300046 = 2 ⋅49650023.

It is a cyclic number.

It is not a de Polignac number, because 64000399 - 2¹⁹ = 63476111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2064529 = 64000399 / (6 + 4 + 0 + 0 + 0 + 3 + 9 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64000399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64000319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032234 + ... + 1032295.

It is an arithmetic number, because the mean of its divisors is an integer number (16516240).

Almost surely, 2^64000399 is an apocalyptic number.

64000399 is a deficient number, since it is larger than the sum of its proper divisors (2064561).

64000399 is a wasteful number, since it uses less digits than its factorization.

64000399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064560.

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

The square root of 64000399 is about 8000.0249374611. The cubic root of 64000399 is about 400.0008312483. Note that the first 3 decimals are identical.

The spelling of 64000399 in words is "sixty-four million, three hundred ninety-nine", and thus it is an aban number.