1639113492 has 48 divisors (see below), whose sum is σ = 4004703360. Its totient is φ = 520806528.

The previous prime is 1639113479. The next prime is 1639113521. The reversal of 1639113492 is 2943119361.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1639113492.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70734 + ... + 91002.

It is an arithmetic number, because the mean of its divisors is an integer number (83431320).

Almost surely, 2^1639113492 is an apocalyptic number.

1639113492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1639113492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2002351680).

1639113492 is an abundant number, since it is smaller than the sum of its proper divisors (2365589868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1639113492 is a wasteful number, since it uses less digits than its factorization.

1639113492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20592 (or 20590 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 1639113492 is about 40485.9666057265. The cubic root of 1639113492 is about 1179.0611827900.

The spelling of 1639113492 in words is "one billion, six hundred thirty-nine million, one hundred thirteen thousand, four hundred ninety-two".