198690253 has 4 divisors (see below), whose sum is σ = 205099648. Its totient is φ = 192280860.

The previous prime is 198690199. The next prime is 198690263. The reversal of 198690253 is 352096891.

It is a happy number.

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: 352096891 = 1327 ⋅265333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198690253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198690263) 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, 3204651 + ... + 3204712.

It is an arithmetic number, because the mean of its divisors is an integer number (51274912).

Almost surely, 2^198690253 is an apocalyptic number.

It is an amenable number.

198690253 is a deficient number, since it is larger than the sum of its proper divisors (6409395).

198690253 is an equidigital number, since it uses as much as digits as its factorization.

198690253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409394.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 198690253 is about 14095.7530128759. The cubic root of 198690253 is about 583.5241763236.

The spelling of 198690253 in words is "one hundred ninety-eight million, six hundred ninety thousand, two hundred fifty-three".