198173790 has 48 divisors (see below), whose sum is σ = 534341808. Its totient is φ = 52845696.

The previous prime is 198173747. The next prime is 198173797. The reversal of 198173790 is 97371891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198173797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38347 + ... + 43206.

It is an arithmetic number, because the mean of its divisors is an integer number (11132121).

Almost surely, 2^198173790 is an apocalyptic number.

198173790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198173790 is an abundant number, since it is smaller than the sum of its proper divisors (336168018).

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

198173790 is an equidigital number, since it uses as much as digits as its factorization.

198173790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81575 (or 81563 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 198173790 is about 14077.4212837437. The cubic root of 198173790 is about 583.0181455555.

The spelling of 198173790 in words is "one hundred ninety-eight million, one hundred seventy-three thousand, seven hundred ninety".