63400639 has 2 divisors, whose sum is σ = 63400640. Its totient is φ = 63400638.

The previous prime is 63400609. The next prime is 63400651. The reversal of 63400639 is 93600436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63400639 - 2⁵ = 63400607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63400639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63400609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31700319 + 31700320.

It is an arithmetic number, because the mean of its divisors is an integer number (31700320).

Almost surely, 2^63400639 is an apocalyptic number.

63400639 is a deficient number, since it is larger than the sum of its proper divisors (1).

63400639 is an equidigital number, since it uses as much as digits as its factorization.

63400639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 63400639 is about 7962.4518208903. The cubic root of 63400639 is about 398.7474129083.

The spelling of 63400639 in words is "sixty-three million, four hundred thousand, six hundred thirty-nine".