18199810 has 16 divisors (see below), whose sum is σ = 33457536. Its totient is φ = 7124848.

The previous prime is 18199801. The next prime is 18199823. The reversal of 18199810 is 1899181.

It is a happy number.

It is a super-2 number, since 2×18199810² = 662466168072200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18199810.

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, 18892 + ... + 19831.

It is an arithmetic number, because the mean of its divisors is an integer number (2091096).

Almost surely, 2^18199810 is an apocalyptic number.

18199810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18199810 is a deficient number, since it is larger than the sum of its proper divisors (15257726).

18199810 is a wasteful number, since it uses less digits than its factorization.

18199810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38777.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 18199810 is about 4266.1235331387. The cubic root of 18199810 is about 263.0402960805.

The spelling of 18199810 in words is "eighteen million, one hundred ninety-nine thousand, eight hundred ten".