199055890 has 48 divisors (see below), whose sum is σ = 417044376. Its totient is φ = 68119040.

The previous prime is 199055851. The next prime is 199055897. The reversal of 199055890 is 98550991.

199055890 = 95² + 96² + ... + 842².

It can be written as a sum of positive squares in 4 ways, for example, as 189365121 + 9690769 = 13761^2 + 3113^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 199055890.

It is not an unprimeable number, because it can be changed into a prime (199055897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15732 + ... + 25408.

Almost surely, 2^199055890 is an apocalyptic number.

199055890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199055890 is an abundant number, since it is smaller than the sum of its proper divisors (217988486).

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

199055890 is a wasteful number, since it uses less digits than its factorization.

199055890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9723 (or 9712 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 199055890 is about 14108.7168091219. The cubic root of 199055890 is about 583.8818977573.

The spelling of 199055890 in words is "one hundred ninety-nine million, fifty-five thousand, eight hundred ninety".