1998922320 has 160 divisors (see below), whose sum is σ = 6904022400. Its totient is φ = 531588096.

The previous prime is 1998922313. The next prime is 1998922327. The reversal of 1998922320 is 232298991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1998922313) and next prime (1998922327).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998922327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 955836 + ... + 957924.

It is an arithmetic number, because the mean of its divisors is an integer number (43150140).

Almost surely, 2^1998922320 is an apocalyptic number.

1998922320 is a gapful number since it is divisible by the number (10) 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 1998922320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3452011200).

1998922320 is an abundant number, since it is smaller than the sum of its proper divisors (4905100080).

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

1998922320 is a wasteful number, since it uses less digits than its factorization.

1998922320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554 (or 2542 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1998922320 is about 44709.3090977707. The cubic root of 1998922320 is about 1259.6947106169.

The spelling of 1998922320 in words is "one billion, nine hundred ninety-eight million, nine hundred twenty-two thousand, three hundred twenty".