63899839 has 2 divisors, whose sum is σ = 63899840. Its totient is φ = 63899838.

The previous prime is 63899827. The next prime is 63899867. The reversal of 63899839 is 93899836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63899839 - 2⁵ = 63899807 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 63899839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63899239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31949919 + 31949920.

It is an arithmetic number, because the mean of its divisors is an integer number (31949920).

Almost surely, 2^63899839 is an apocalyptic number.

63899839 is a deficient number, since it is larger than the sum of its proper divisors (1).

63899839 is an equidigital number, since it uses as much as digits as its factorization.

63899839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 55.

The square root of 63899839 is about 7993.7374863076. The cubic root of 63899839 is about 399.7912222986.

The spelling of 63899839 in words is "sixty-three million, eight hundred ninety-nine thousand, eight hundred thirty-nine".