1998731120 has 40 divisors (see below), whose sum is σ = 4772652864. Its totient is φ = 777883392.

The previous prime is 1998731113. The next prime is 1998731129. The reversal of 1998731120 is 211378991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998731129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334664 + ... + 340583.

Almost surely, 2^1998731120 is an apocalyptic number.

1998731120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998731120 is an abundant number, since it is smaller than the sum of its proper divisors (2773921744).

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

1998731120 is a wasteful number, since it uses less digits than its factorization.

1998731120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675297 (or 675291 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1998731120 is about 44707.1707894830. The cubic root of 1998731120 is about 1259.6545454229.

The spelling of 1998731120 in words is "one billion, nine hundred ninety-eight million, seven hundred thirty-one thousand, one hundred twenty".