198981365 has 8 divisors (see below), whose sum is σ = 260484768. Its totient is φ = 144713680.

The previous prime is 198981359. The next prime is 198981371. The reversal of 198981365 is 563189891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (198981359) and next prime (198981371).

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

It is a de Polignac number, because none of the positive numbers 2^k-198981365 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1808867 + ... + 1808976.

It is an arithmetic number, because the mean of its divisors is an integer number (32560596).

Almost surely, 2^198981365 is an apocalyptic number.

It is an amenable number.

198981365 is a deficient number, since it is larger than the sum of its proper divisors (61503403).

198981365 is a wasteful number, since it uses less digits than its factorization.

198981365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617859.

The product of its digits is 466560, while the sum is 50.

The square root of 198981365 is about 14106.0754641396. The cubic root of 198981365 is about 583.8090216922.

The spelling of 198981365 in words is "one hundred ninety-eight million, nine hundred eighty-one thousand, three hundred sixty-five".