90231930 has 24 divisors (see below), whose sum is σ = 234603252. Its totient is φ = 24061824.

The previous prime is 90231913. The next prime is 90231949. The reversal of 90231930 is 3913209.

It can be written as a sum of positive squares in 2 ways, for example, as 82464561 + 7767369 = 9081^2 + 2787^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90231894 and 90231903.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 501199 + ... + 501378.

Almost surely, 2^90231930 is an apocalyptic number.

90231930 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90231930 is an abundant number, since it is smaller than the sum of its proper divisors (144371322).

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

90231930 is a wasteful number, since it uses less digits than its factorization.

90231930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002590 (or 1002587 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 90231930 is about 9499.0488997583. The cubic root of 90231930 is about 448.5250971217.

The spelling of 90231930 in words is "ninety million, two hundred thirty-one thousand, nine hundred thirty".