1638130032 has 120 divisors (see below), whose sum is σ = 5715765120. Its totient is φ = 425485440.

The previous prime is 1638130019. The next prime is 1638130061. The reversal of 1638130032 is 2300318361.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1638129978 and 1638130005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62782 + ... + 84957.

It is an arithmetic number, because the mean of its divisors is an integer number (47631376).

Almost surely, 2^1638130032 is an apocalyptic number.

1638130032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1638130032 is an abundant number, since it is smaller than the sum of its proper divisors (4077635088).

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

1638130032 is a wasteful number, since it uses less digits than its factorization.

1638130032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147771 (or 147762 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1638130032 is about 40473.8190933349. The cubic root of 1638130032 is about 1178.8253253170.

Adding to 1638130032 its reverse (2300318361), we get a palindrome (3938448393).

The spelling of 1638130032 in words is "one billion, six hundred thirty-eight million, one hundred thirty thousand, thirty-two".