198265815 has 48 divisors (see below), whose sum is σ = 396972576. Its totient is φ = 90470400.

The previous prime is 198265789. The next prime is 198265843. The reversal of 198265815 is 518562891.

It is a happy number.

It is not a de Polignac number, because 198265815 - 2⁶ = 198265751 is a prime.

It is a super-2 number, since 2×198265815² = 78618666795228450, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3366 + ... + 20195.

It is an arithmetic number, because the mean of its divisors is an integer number (8270262).

Almost surely, 2^198265815 is an apocalyptic number.

198265815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198265815 is an abundant number, since it is smaller than the sum of its proper divisors (198706761).

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

198265815 is a wasteful number, since it uses less digits than its factorization.

198265815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23600 (or 23597 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 198265815 is about 14080.6894362457. The cubic root of 198265815 is about 583.1083760248.

The spelling of 198265815 in words is "one hundred ninety-eight million, two hundred sixty-five thousand, eight hundred fifteen".