199940418 has 48 divisors (see below), whose sum is σ = 440294400. Its totient is φ = 65566368.

The previous prime is 199940393. The next prime is 199940423. The reversal of 199940418 is 814049991.

199940418 is a `hidden beast` number, since 199 + 9 + 40 + 418 = 666.

It is a Curzon number.

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, 340321 + ... + 340907.

It is an arithmetic number, because the mean of its divisors is an integer number (9172800).

Almost surely, 2^199940418 is an apocalyptic number.

199940418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199940418 is an abundant number, since it is smaller than the sum of its proper divisors (240353982).

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

199940418 is a wasteful number, since it uses less digits than its factorization.

199940418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 199940418 is about 14140.0289250058. The cubic root of 199940418 is about 584.7454689332.

The spelling of 199940418 in words is "one hundred ninety-nine million, nine hundred forty thousand, four hundred eighteen".