198923287 has 2 divisors, whose sum is σ = 198923288. Its totient is φ = 198923286.

The previous prime is 198923269. The next prime is 198923299. The reversal of 198923287 is 782329891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198923287 - 2¹⁵ = 198890519 is a prime.

It is a super-2 number, since 2×198923287² = 79140948221768738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198923287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198923687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99461643 + 99461644.

It is an arithmetic number, because the mean of its divisors is an integer number (99461644).

Almost surely, 2^198923287 is an apocalyptic number.

198923287 is a deficient number, since it is larger than the sum of its proper divisors (1).

198923287 is an equidigital number, since it uses as much as digits as its factorization.

198923287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 198923287 is about 14104.0166973809. The cubic root of 198923287 is about 583.7522161052.

The spelling of 198923287 in words is "one hundred ninety-eight million, nine hundred twenty-three thousand, two hundred eighty-seven".