199487790 has 96 divisors (see below), whose sum is σ = 540573696. Its totient is φ = 50984640.

The previous prime is 199487753. The next prime is 199487807. The reversal of 199487790 is 97784991.

199487790 is a `hidden beast` number, since 1 + 99 + 487 + 79 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 354049 + ... + 354611.

It is an arithmetic number, because the mean of its divisors is an integer number (5630976).

Almost surely, 2^199487790 is an apocalyptic number.

199487790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199487790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270286848).

199487790 is an abundant number, since it is smaller than the sum of its proper divisors (341085906).

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

199487790 is a wasteful number, since it uses less digits than its factorization.

199487790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 199487790 is about 14124.0146558972. The cubic root of 199487790 is about 584.3038838029.

The spelling of 199487790 in words is "one hundred ninety-nine million, four hundred eighty-seven thousand, seven hundred ninety".