18440871490 has 32 divisors (see below), whose sum is σ = 33298614000. Its totient is φ = 7353043968.

The previous prime is 18440871457. The next prime is 18440871517. The reversal of 18440871490 is 9417804481.

It can be written as a sum of positive squares in 8 ways, for example, as 7123528801 + 11317342689 = 84401^2 + 106383^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18440871490.

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, 5745006 + ... + 5748214.

Almost surely, 2^18440871490 is an apocalyptic number.

18440871490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18440871490 is a deficient number, since it is larger than the sum of its proper divisors (14857742510).

18440871490 is a wasteful number, since it uses less digits than its factorization.

18440871490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 18440871490 in words is "eighteen billion, four hundred forty million, eight hundred seventy-one thousand, four hundred ninety".