199945000 has 40 divisors (see below), whose sum is σ = 468482850. Its totient is φ = 79976000.

The previous prime is 199944977. The next prime is 199945021. The reversal of 199945000 is 549991.

It can be written as a sum of positive squares in 5 ways, for example, as 1304164 + 198640836 = 1142^2 + 14094^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14995 + ... + 24994.

Almost surely, 2^199945000 is an apocalyptic number.

199945000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199945000 is an abundant number, since it is smaller than the sum of its proper divisors (268537850).

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

199945000 is an equidigital number, since it uses as much as digits as its factorization.

199945000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40015 (or 39996 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 199945000 is about 14140.1909463769. The cubic root of 199945000 is about 584.7499357360.

The spelling of 199945000 in words is "one hundred ninety-nine million, nine hundred forty-five thousand".