19800418 has 8 divisors (see below), whose sum is σ = 32400720. Its totient is φ = 9000180.

The previous prime is 19800383. The next prime is 19800421. The reversal of 19800418 is 81400891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19800418.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449988 + ... + 450031.

It is an arithmetic number, because the mean of its divisors is an integer number (4050090).

Almost surely, 2^19800418 is an apocalyptic number.

19800418 is the 2379-th centered heptagonal number.

19800418 is a deficient number, since it is larger than the sum of its proper divisors (12600302).

19800418 is a wasteful number, since it uses less digits than its factorization.

19800418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900032.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 19800418 is about 4449.7660612666. The cubic root of 19800418 is about 270.5358266434.

The spelling of 19800418 in words is "nineteen million, eight hundred thousand, four hundred eighteen".