63840399 has 16 divisors (see below), whose sum is σ = 102401280. Its totient is φ = 34560000.

The previous prime is 63840353. The next prime is 63840407. The reversal of 63840399 is 99304836.

63840399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63840399 - 2¹¹ = 63838351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63840399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63840199) 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 15 ways as a sum of consecutive naturals, for example, 79602 + ... + 80399.

It is an arithmetic number, because the mean of its divisors is an integer number (6400080).

Almost surely, 2^63840399 is an apocalyptic number.

63840399 is a deficient number, since it is larger than the sum of its proper divisors (38560881).

63840399 is a wasteful number, since it uses less digits than its factorization.

63840399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160030.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 63840399 is about 7990.0187108667. The cubic root of 63840399 is about 399.6672211390.

The spelling of 63840399 in words is "sixty-three million, eight hundred forty thousand, three hundred ninety-nine".