18903944490 has 32 divisors (see below), whose sum is σ = 47342054016. Its totient is φ = 4821875520.

The previous prime is 18903944483. The next prime is 18903944537. The reversal of 18903944490 is 9444930981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13697821 + ... + 13699200.

It is an arithmetic number, because the mean of its divisors is an integer number (1479439188).

Almost surely, 2^18903944490 is an apocalyptic number.

18903944490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18903944490 is an abundant number, since it is smaller than the sum of its proper divisors (28438109526).

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

18903944490 is a wasteful number, since it uses less digits than its factorization.

18903944490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27397054.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 18903944490 in words is "eighteen billion, nine hundred three million, nine hundred forty-four thousand, four hundred ninety".