923121990 has 48 divisors (see below), whose sum is σ = 2742992928. Its totient is φ = 210999168.

The previous prime is 923121959. The next prime is 923122021. The reversal of 923121990 is 99121329.

It is a happy number.

923121990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (923121959) and next prime (923122021).

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, 732007 + ... + 733266.

It is an arithmetic number, because the mean of its divisors is an integer number (57145686).

Almost surely, 2^923121990 is an apocalyptic number.

923121990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

923121990 is an abundant number, since it is smaller than the sum of its proper divisors (1819870938).

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

923121990 is a wasteful number, since it uses less digits than its factorization.

923121990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465293 (or 1465290 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 923121990 is about 30382.9226704740. The cubic root of 923121990 is about 973.6877336082.

The spelling of 923121990 in words is "nine hundred twenty-three million, one hundred twenty-one thousand, nine hundred ninety".