1988190840 has 64 divisors (see below), whose sum is σ = 6223910400. Its totient is φ = 507132032.

The previous prime is 1988190823. The next prime is 1988190899. The reversal of 1988190840 is 480918891.

It is a self number, because there is not a number n which added to its sum of digits gives 1988190840.

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, 357420 + ... + 362939.

It is an arithmetic number, because the mean of its divisors is an integer number (97248600).

Almost surely, 2^1988190840 is an apocalyptic number.

1988190840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988190840 is an abundant number, since it is smaller than the sum of its proper divisors (4235719560).

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

1988190840 is a wasteful number, since it uses less digits than its factorization.

1988190840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720396 (or 720392 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 1988190840 is about 44589.1336538399. The cubic root of 1988190840 is about 1257.4363849472.

The spelling of 1988190840 in words is "one billion, nine hundred eighty-eight million, one hundred ninety thousand, eight hundred forty".