199956890 has 64 divisors (see below), whose sum is σ = 439686144. Its totient is φ = 63909888.

The previous prime is 199956881. The next prime is 199956899. The reversal of 199956890 is 98659991.

It is an interprime number because it is at equal distance from previous prime (199956881) and next prime (199956899).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199956899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133727 + ... + 135213.

It is an arithmetic number, because the mean of its divisors is an integer number (6870096).

Almost surely, 2^199956890 is an apocalyptic number.

199956890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199956890 is an abundant number, since it is smaller than the sum of its proper divisors (239729254).

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

199956890 is a wasteful number, since it uses less digits than its factorization.

199956890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 1574640, while the sum is 56.

The square root of 199956890 is about 14140.6113729216. The cubic root of 199956890 is about 584.7615264883.

The spelling of 199956890 in words is "one hundred ninety-nine million, nine hundred fifty-six thousand, eight hundred ninety".