1021998432 has 144 divisors (see below), whose sum is σ = 3320352000. Its totient is φ = 269508096.

The previous prime is 1021998389. The next prime is 1021998443. The reversal of 1021998432 is 2348991201.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109069 + ... + 118067.

It is an arithmetic number, because the mean of its divisors is an integer number (23058000).

Almost surely, 2^1021998432 is an apocalyptic number.

1021998432 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 1021998432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660176000).

1021998432 is an abundant number, since it is smaller than the sum of its proper divisors (2298353568).

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

1021998432 is a wasteful number, since it uses less digits than its factorization.

1021998432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045 (or 9024 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1021998432 is about 31968.7102023213. The cubic root of 1021998432 is about 1007.2796882133.

The spelling of 1021998432 in words is "one billion, twenty-one million, nine hundred ninety-eight thousand, four hundred thirty-two".