19899418 has 48 divisors (see below), whose sum is σ = 39759552. Its totient is φ = 7286400.

The previous prime is 19899353. The next prime is 19899437. The reversal of 19899418 is 81499891.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28453 + ... + 29143.

It is an arithmetic number, because the mean of its divisors is an integer number (828324).

Almost surely, 2^19899418 is an apocalyptic number.

19899418 is a deficient number, since it is larger than the sum of its proper divisors (19860134).

19899418 is a wasteful number, since it uses less digits than its factorization.

19899418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 728 counting only the distinct ones).

The product of its digits is 186624, while the sum is 49.

The square root of 19899418 is about 4460.8763712975. The cubic root of 19899418 is about 270.9859607928.

The spelling of 19899418 in words is "nineteen million, eight hundred ninety-nine thousand, four hundred eighteen".