198861399 has 40 divisors (see below), whose sum is σ = 325573248. Its totient is φ = 119964240.

The previous prime is 198861389. The next prime is 198861409. The reversal of 198861399 is 993168891.

198861399 is a `hidden beast` number, since 19 + 8 + 8 + 613 + 9 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (198861389) and next prime (198861409).

It is not a de Polignac number, because 198861399 - 2⁹ = 198860887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198861389) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 273174 + ... + 273900.

Almost surely, 2^198861399 is an apocalyptic number.

198861399 is a deficient number, since it is larger than the sum of its proper divisors (126711849).

198861399 is a wasteful number, since it uses less digits than its factorization.

198861399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1048 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 198861399 is about 14101.8225417852. The cubic root of 198861399 is about 583.6916718205.

The spelling of 198861399 in words is "one hundred ninety-eight million, eight hundred sixty-one thousand, three hundred ninety-nine".