198987253 has 4 divisors (see below), whose sum is σ = 201957280. Its totient is φ = 196017228.

The previous prime is 198987223. The next prime is 198987259. The reversal of 198987253 is 352789891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 352789891 = 19 ⋅18567889.

It is a cyclic number.

It is not a de Polignac number, because 198987253 - 2⁹ = 198986741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198987253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198987259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484913 + ... + 1485046.

It is an arithmetic number, because the mean of its divisors is an integer number (50489320).

Almost surely, 2^198987253 is an apocalyptic number.

It is an amenable number.

198987253 is a deficient number, since it is larger than the sum of its proper divisors (2970027).

198987253 is an equidigital number, since it uses as much as digits as its factorization.

198987253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970026.

The product of its digits is 1088640, while the sum is 52.

The square root of 198987253 is about 14106.2841669945. The cubic root of 198987253 is about 583.8147800767.

The spelling of 198987253 in words is "one hundred ninety-eight million, nine hundred eighty-seven thousand, two hundred fifty-three".