1998486432 has 84 divisors (see below), whose sum is σ = 5899150530. Its totient is φ = 666154368.

The previous prime is 1998486377. The next prime is 1998486433. The reversal of 1998486432 is 2346848991.

It can be written as a sum of positive squares in only one way, i.e., 1710980496 + 287505936 = 41364^2 + 16956^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1998486433) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 19507 + ... + 66162.

Almost surely, 2^1998486432 is an apocalyptic number.

1998486432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1998486432 is an abundant number, since it is smaller than the sum of its proper divisors (3900664098).

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

1998486432 is an frugal number, since it uses more digits than its factorization.

1998486432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85697 (or 85674 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 1998486432 is about 44704.4341424875. The cubic root of 1998486432 is about 1259.6031403211.

The spelling of 1998486432 in words is "one billion, nine hundred ninety-eight million, four hundred eighty-six thousand, four hundred thirty-two".