1638130689 has 24 divisors (see below), whose sum is σ = 2627909280. Its totient is φ = 1008077616.

The previous prime is 1638130639. The next prime is 1638130691. The reversal of 1638130689 is 9860318361.

It is a happy number.

1638130689 is a `hidden beast` number, since 1 + 638 + 1 + 3 + 0 + 6 + 8 + 9 = 666.

It is not a de Polignac number, because 1638130689 - 2¹⁵ = 1638097921 is a prime.

It is a super-2 number, since 2×1638130689² = 5366944308487229442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1638130609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174939 + ... + 184064.

It is an arithmetic number, because the mean of its divisors is an integer number (109496220).

Almost surely, 2^1638130689 is an apocalyptic number.

It is an amenable number.

1638130689 is a deficient number, since it is larger than the sum of its proper divisors (989778591).

1638130689 is a wasteful number, since it uses less digits than its factorization.

1638130689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359038 (or 359019 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1638130689 is about 40473.8272096919. The cubic root of 1638130689 is about 1178.8254829130.

The spelling of 1638130689 in words is "one billion, six hundred thirty-eight million, one hundred thirty thousand, six hundred eighty-nine".