163402639 has 2 divisors, whose sum is σ = 163402640. Its totient is φ = 163402638.

The previous prime is 163402609. The next prime is 163402651. The reversal of 163402639 is 936204361.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163402639 - 2⁵ = 163402607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163402609) 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 as a sum of consecutive naturals, namely, 81701319 + 81701320.

It is an arithmetic number, because the mean of its divisors is an integer number (81701320).

Almost surely, 2^163402639 is an apocalyptic number.

163402639 is a deficient number, since it is larger than the sum of its proper divisors (1).

163402639 is an equidigital number, since it uses as much as digits as its factorization.

163402639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 163402639 is about 12782.9041692410. The cubic root of 163402639 is about 546.7049700919.

The spelling of 163402639 in words is "one hundred sixty-three million, four hundred two thousand, six hundred thirty-nine".