18995223790 has 32 divisors (see below), whose sum is σ = 34378344000. Its totient is φ = 7556659200.

The previous prime is 18995223763. The next prime is 18995223791. The reversal of 18995223790 is 9732259981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18995223791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1427086 + ... + 1440334.

It is an arithmetic number, because the mean of its divisors is an integer number (1074323250).

Almost surely, 2^18995223790 is an apocalyptic number.

18995223790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18995223790 is a deficient number, since it is larger than the sum of its proper divisors (15383120210).

18995223790 is a wasteful number, since it uses less digits than its factorization.

18995223790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14028.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 18995223790 in words is "eighteen billion, nine hundred ninety-five million, two hundred twenty-three thousand, seven hundred ninety".