198706990 has 32 divisors (see below), whose sum is σ = 364538880. Its totient is φ = 77968800.

The previous prime is 198706987. The next prime is 198707011. The reversal of 198706990 is 99607891.

198706990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169105 + ... + 170275.

It is an arithmetic number, because the mean of its divisors is an integer number (11391840).

Almost surely, 2^198706990 is an apocalyptic number.

198706990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198706990 is a deficient number, since it is larger than the sum of its proper divisors (165831890).

198706990 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (198706989) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1488).

198706990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 198706990 is about 14096.3466898342. The cubic root of 198706990 is about 583.5405605695.

Subtracting from 198706990 its reverse (99607891), we obtain a palindrome (99099099).

The spelling of 198706990 in words is "one hundred ninety-eight million, seven hundred six thousand, nine hundred ninety".