1998238320 has 360 divisors, whose sum is σ = 7465855488. Its totient is φ = 476098560.

The previous prime is 1998238289. The next prime is 1998238339. The reversal of 1998238320 is 238328991.

1998238320 is a `hidden beast` number, since 1 + 9 + 98 + 238 + 320 = 666.

1998238320 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (360).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15734097 + ... + 15734223.

Almost surely, 2^1998238320 is an apocalyptic number.

1998238320 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 1998238320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3732927744).

1998238320 is an abundant number, since it is smaller than the sum of its proper divisors (5467617168).

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

1998238320 is a wasteful number, since it uses less digits than its factorization.

1998238320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1998238320 is about 44701.6590296154. The cubic root of 1998238320 is about 1259.5510116062.

The spelling of 1998238320 in words is "one billion, nine hundred ninety-eight million, two hundred thirty-eight thousand, three hundred twenty".