198904590 has 48 divisors (see below), whose sum is σ = 547576848. Its totient is φ = 49920768.

The previous prime is 198904577. The next prime is 198904613. The reversal of 198904590 is 95409891.

198904590 is a `hidden beast` number, since 198 + 9 + 0 + 459 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63472 + ... + 66531.

It is an arithmetic number, because the mean of its divisors is an integer number (11407851).

Almost surely, 2^198904590 is an apocalyptic number.

198904590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198904590 is an abundant number, since it is smaller than the sum of its proper divisors (348672258).

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

198904590 is a wasteful number, since it uses less digits than its factorization.

198904590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130033 (or 130030 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 198904590 is about 14103.3538564414. The cubic root of 198904590 is about 583.7339263793.

The spelling of 198904590 in words is "one hundred ninety-eight million, nine hundred four thousand, five hundred ninety".