1023121998 has 24 divisors (see below), whose sum is σ = 2222953200. Its totient is φ = 340088544.

The previous prime is 1023121997. The next prime is 1023122027. The reversal of 1023121998 is 8991213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023121997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72703 + ... + 85626.

It is an arithmetic number, because the mean of its divisors is an integer number (92623050).

Almost surely, 2^1023121998 is an apocalyptic number.

1023121998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1023121998 is an abundant number, since it is smaller than the sum of its proper divisors (1199831202).

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

1023121998 is a wasteful number, since it uses less digits than its factorization.

1023121998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158696 (or 158693 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 1023121998 is about 31986.2782767861. The cubic root of 1023121998 is about 1007.6486811875.

The spelling of 1023121998 in words is "one billion, twenty-three million, one hundred twenty-one thousand, nine hundred ninety-eight".