198749287 has 8 divisors (see below), whose sum is σ = 217190160. Its totient is φ = 180370560.

The previous prime is 198749273. The next prime is 198749303. The reversal of 198749287 is 782947891.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198749287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198749207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8712 + ... + 21757.

It is an arithmetic number, because the mean of its divisors is an integer number (27148770).

Almost surely, 2^198749287 is an apocalyptic number.

198749287 is a deficient number, since it is larger than the sum of its proper divisors (18440873).

198749287 is a wasteful number, since it uses less digits than its factorization.

198749287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31073.

The product of its digits is 2032128, while the sum is 55.

The square root of 198749287 is about 14097.8468923449. The cubic root of 198749287 is about 583.5819620052.

It can be divided in two parts, 19874 and 9287, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 198749287 in words is "one hundred ninety-eight million, seven hundred forty-nine thousand, two hundred eighty-seven".