198465990 has 32 divisors (see below), whose sum is σ = 504338400. Its totient is φ = 49810944.

The previous prime is 198465959. The next prime is 198465991. The reversal of 198465990 is 99564891.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198465991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194065 + ... + 195084.

It is an arithmetic number, because the mean of its divisors is an integer number (15760575).

Almost surely, 2^198465990 is an apocalyptic number.

198465990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198465990 is an abundant number, since it is smaller than the sum of its proper divisors (305872410).

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

198465990 is a wasteful number, since it uses less digits than its factorization.

198465990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389176.

The product of its (nonzero) digits is 699840, while the sum is 51.

The square root of 198465990 is about 14087.7957821655. The cubic root of 198465990 is about 583.3045511422.

The spelling of 198465990 in words is "one hundred ninety-eight million, four hundred sixty-five thousand, nine hundred ninety".