1621988160 has 112 divisors (see below), whose sum is σ = 5545994496. Its totient is φ = 399255552.

The previous prime is 1621988153. The next prime is 1621988161. The reversal of 1621988160 is 618891261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621988161) 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, 52504 + ... + 77463.

It is an arithmetic number, because the mean of its divisors is an integer number (49517808).

Almost surely, 2^1621988160 is an apocalyptic number.

1621988160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621988160 is an abundant number, since it is smaller than the sum of its proper divisors (3924006336).

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

1621988160 is a wasteful number, since it uses less digits than its factorization.

1621988160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130000 (or 129990 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1621988160 is about 40273.9141380621. The cubic root of 1621988160 is about 1174.9405516928.

The spelling of 1621988160 in words is "one billion, six hundred twenty-one million, nine hundred eighty-eight thousand, one hundred sixty".