1988981604 has 27 divisors (see below), whose sum is σ = 5028379993. Its totient is φ = 662904672.

The previous prime is 1988981567. The next prime is 1988981609. The reversal of 1988981604 is 4061898891.

The square root of 1988981604 is 44598.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 118592100 + 1870389504 = 10890^2 + 43248^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988981609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 263872 + ... + 271304.

Almost surely, 2^1988981604 is an apocalyptic number.

1988981604 is the 44598-th square number.

It is an amenable number.

1988981604 is an abundant number, since it is smaller than the sum of its proper divisors (3039398389).

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

1988981604 is an frugal number, since it uses more digits than its factorization.

1988981604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14876 (or 7438 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The cubic root of 1988981604 is about 1257.6030697558.

The spelling of 1988981604 in words is "one billion, nine hundred eighty-eight million, nine hundred eighty-one thousand, six hundred four".