198879645 has 8 divisors (see below), whose sum is σ = 318207456. Its totient is φ = 106069136.

The previous prime is 198879623. The next prime is 198879649. The reversal of 198879645 is 546978891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198879645 - 2¹⁵ = 198846877 is a prime.

It is a super-2 number, since 2×198879645² = 79106226390652050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198879649) 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 7 ways as a sum of consecutive naturals, for example, 6629307 + ... + 6629336.

It is an arithmetic number, because the mean of its divisors is an integer number (39775932).

Almost surely, 2^198879645 is an apocalyptic number.

198879645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198879645 is a deficient number, since it is larger than the sum of its proper divisors (119327811).

198879645 is a wasteful number, since it uses less digits than its factorization.

198879645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13258651.

The product of its digits is 4354560, while the sum is 57.

The square root of 198879645 is about 14102.4694646009. The cubic root of 198879645 is about 583.7095229680.

The spelling of 198879645 in words is "one hundred ninety-eight million, eight hundred seventy-nine thousand, six hundred forty-five".