1808390418 has 16 divisors (see below), whose sum is σ = 3626228736. Its totient is φ = 601222160.

The previous prime is 1808390371. The next prime is 1808390431. The reversal of 1808390418 is 8140938081.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1808390418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391173 + ... + 395768.

It is an arithmetic number, because the mean of its divisors is an integer number (226639296).

Almost surely, 2^1808390418 is an apocalyptic number.

1808390418 is an abundant number, since it is smaller than the sum of its proper divisors (1817838318).

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

1808390418 is a wasteful number, since it uses less digits than its factorization.

1808390418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787329.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 1808390418 is about 42525.1739326249. The cubic root of 1808390418 is about 1218.3275520373.

The spelling of 1808390418 in words is "one billion, eight hundred eight million, three hundred ninety thousand, four hundred eighteen".