198023990 has 32 divisors (see below), whose sum is σ = 378263520. Its totient is φ = 74381824.

The previous prime is 198023957. The next prime is 198023993. The reversal of 198023990 is 99320891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198023993) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 94676 + ... + 96744.

It is an arithmetic number, because the mean of its divisors is an integer number (11820735).

Almost surely, 2^198023990 is an apocalyptic number.

198023990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198023990 is a deficient number, since it is larger than the sum of its proper divisors (180239530).

198023990 is a wasteful number, since it uses less digits than its factorization.

198023990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 198023990 is about 14072.0997011818. The cubic root of 198023990 is about 582.8712069630.

The spelling of 198023990 in words is "one hundred ninety-eight million, twenty-three thousand, nine hundred ninety".