18215239490 has 32 divisors (see below), whose sum is σ = 38484094464. Its totient is φ = 6076434240.

The previous prime is 18215239487. The next prime is 18215239519. The reversal of 18215239490 is 9493251281.

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, 3513866 + ... + 3519045.

It is an arithmetic number, because the mean of its divisors is an integer number (1202627952).

Almost surely, 2^18215239490 is an apocalyptic number.

18215239490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18215239490 is an abundant number, since it is smaller than the sum of its proper divisors (20268854974).

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

18215239490 is a wasteful number, since it uses less digits than its factorization.

18215239490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032962.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 18215239490 in words is "eighteen billion, two hundred fifteen million, two hundred thirty-nine thousand, four hundred ninety".