1638791130 has 32 divisors (see below), whose sum is σ = 4059975168. Its totient is φ = 422913600.

The previous prime is 1638791117. The next prime is 1638791137. The reversal of 1638791130 is 311978361.

It is not an unprimeable number, because it can be changed into a prime (1638791137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 880141 + ... + 882000.

It is an arithmetic number, because the mean of its divisors is an integer number (126874224).

Almost surely, 2^1638791130 is an apocalyptic number.

1638791130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1638791130 is an abundant number, since it is smaller than the sum of its proper divisors (2421184038).

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

1638791130 is a wasteful number, since it uses less digits than its factorization.

1638791130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762182.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1638791130 is about 40481.9852527022. The cubic root of 1638791130 is about 1178.9838829889.

The spelling of 1638791130 in words is "one billion, six hundred thirty-eight million, seven hundred ninety-one thousand, one hundred thirty".