199485990 has 192 divisors, whose sum is σ = 622702080. Its totient is φ = 45411840.

The previous prime is 199485967. The next prime is 199485991. The reversal of 199485990 is 99584991.

199485990 is a `hidden beast` number, since 1 + 9 + 9 + 48 + 599 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199485991) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 454191 + ... + 454629.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^199485990 is an apocalyptic number.

199485990 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 199485990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311351040).

199485990 is an abundant number, since it is smaller than the sum of its proper divisors (423216090).

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

199485990 is a wasteful number, since it uses less digits than its factorization.

199485990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 199485990 is about 14123.9509344942. The cubic root of 199485990 is about 584.3021263852.

Subtracting from 199485990 its reverse (99584991), we obtain a palindrome (99900999).

The spelling of 199485990 in words is "one hundred ninety-nine million, four hundred eighty-five thousand, nine hundred ninety".