18940192398 has 24 divisors (see below), whose sum is σ = 42821305488. Its totient is φ = 6038901792.

The previous prime is 18940192393. The next prime is 18940192423. The reversal of 18940192398 is 89329104981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940192393) 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 11 ways as a sum of consecutive naturals, for example, 22874215 + ... + 22875042.

It is an arithmetic number, because the mean of its divisors is an integer number (1784221062).

Almost surely, 2^18940192398 is an apocalyptic number.

18940192398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18940192398 is an abundant number, since it is smaller than the sum of its proper divisors (23881113090).

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

18940192398 is a wasteful number, since it uses less digits than its factorization.

18940192398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45749288 (or 45749285 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 18940192398 in words is "eighteen billion, nine hundred forty million, one hundred ninety-two thousand, three hundred ninety-eight".