18235812990 has 32 divisors (see below), whose sum is σ = 43784188416. Its totient is φ = 4860857120.

The previous prime is 18235812983. The next prime is 18235812997. The reversal of 18235812990 is 9921853281.

It is an interprime number because it is at equal distance from previous prime (18235812983) and next prime (18235812997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18235812997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52746 + ... + 198125.

It is an arithmetic number, because the mean of its divisors is an integer number (1368255888).

Almost surely, 2^18235812990 is an apocalyptic number.

18235812990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18235812990 is an abundant number, since it is smaller than the sum of its proper divisors (25548375426).

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

18235812990 is a wasteful number, since it uses less digits than its factorization.

18235812990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253304.

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 18235812990 in words is "eighteen billion, two hundred thirty-five million, eight hundred twelve thousand, nine hundred ninety".