1638122963 has 8 divisors (see below), whose sum is σ = 1644505200. Its totient is φ = 1631750400.

The previous prime is 1638122947. The next prime is 1638122977. The reversal of 1638122963 is 3692218361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1638122963 - 2⁴ = 1638122947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1638122963.

It is not an unprimeable number, because it can be changed into a prime (1638122903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605588 + ... + 608286.

It is an arithmetic number, because the mean of its divisors is an integer number (205563150).

Almost surely, 2^1638122963 is an apocalyptic number.

1638122963 is a deficient number, since it is larger than the sum of its proper divisors (6382237).

1638122963 is a wasteful number, since it uses less digits than its factorization.

1638122963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837.

The product of its digits is 93312, while the sum is 41.

The square root of 1638122963 is about 40473.7317651832. The cubic root of 1638122963 is about 1178.8236296584.

The spelling of 1638122963 in words is "one billion, six hundred thirty-eight million, one hundred twenty-two thousand, nine hundred sixty-three".