1638970520 has 32 divisors (see below), whose sum is σ = 4022928720. Its totient is φ = 595989120.

The previous prime is 1638970519. The next prime is 1638970573. The reversal of 1638970520 is 250798361.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1862027 + ... + 1862906.

Almost surely, 2^1638970520 is an apocalyptic number.

1638970520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638970520 is an abundant number, since it is smaller than the sum of its proper divisors (2383958200).

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

1638970520 is a wasteful number, since it uses less digits than its factorization.

1638970520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724955 (or 3724951 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 1638970520 is about 40484.2008689810. The cubic root of 1638970520 is about 1179.0269005112.

The spelling of 1638970520 in words is "one billion, six hundred thirty-eight million, nine hundred seventy thousand, five hundred twenty".