1998267432 has 96 divisors (see below), whose sum is σ = 5832933120. Its totient is φ = 568807680.

The previous prime is 1998267407. The next prime is 1998267437. The reversal of 1998267432 is 2347628991.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1998267437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 327433 + ... + 333479.

It is an arithmetic number, because the mean of its divisors is an integer number (60759720).

Almost surely, 2^1998267432 is an apocalyptic number.

1998267432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998267432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2916466560).

1998267432 is an abundant number, since it is smaller than the sum of its proper divisors (3834665688).

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

1998267432 is a wasteful number, since it uses less digits than its factorization.

1998267432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351 (or 6340 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The square root of 1998267432 is about 44701.9846539278. The cubic root of 1998267432 is about 1259.5571283059.

The spelling of 1998267432 in words is "one billion, nine hundred ninety-eight million, two hundred sixty-seven thousand, four hundred thirty-two".