63381399 has 16 divisors (see below), whose sum is σ = 89683200. Its totient is φ = 39729536.

The previous prime is 63381377. The next prime is 63381403. The reversal of 63381399 is 99318336.

It is a cyclic number.

It is not a de Polignac number, because 63381399 - 2⁷ = 63381271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63381399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63381319) 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, 3714 + ... + 11855.

It is an arithmetic number, because the mean of its divisors is an integer number (5605200).

Almost surely, 2^63381399 is an apocalyptic number.

63381399 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

63381399 is a deficient number, since it is larger than the sum of its proper divisors (26301801).

63381399 is a wasteful number, since it uses less digits than its factorization.

63381399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15654.

The product of its digits is 104976, while the sum is 42.

The square root of 63381399 is about 7961.2435586408. The cubic root of 63381399 is about 398.7070732706.

The spelling of 63381399 in words is "sixty-three million, three hundred eighty-one thousand, three hundred ninety-nine".