1988189764 has 24 divisors (see below), whose sum is σ = 3807635328. Its totient is φ = 900865440.

The previous prime is 1988189741. The next prime is 1988189767. The reversal of 1988189764 is 4679818891.

It is not an unprimeable number, because it can be changed into a prime (1988189767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57324 + ... + 85219.

It is an arithmetic number, because the mean of its divisors is an integer number (158651472).

Almost surely, 2^1988189764 is an apocalyptic number.

It is an amenable number.

1988189764 is a deficient number, since it is larger than the sum of its proper divisors (1819445564).

1988189764 is a wasteful number, since it uses less digits than its factorization.

1988189764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142875 (or 142873 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 61.

The square root of 1988189764 is about 44589.1215881183. The cubic root of 1988189764 is about 1257.4361581075.

The spelling of 1988189764 in words is "one billion, nine hundred eighty-eight million, one hundred eighty-nine thousand, seven hundred sixty-four".