198987841 has 4 divisors (see below), whose sum is σ = 214294612. Its totient is φ = 183681072.

The previous prime is 198987827. The next prime is 198987847. The reversal of 198987841 is 148789891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 148789891 = 2767 ⋅53773.

It can be written as a sum of positive squares in 2 ways, for example, as 32035600 + 166952241 = 5660^2 + 12921^2 .

It is a cyclic number.

It is not a de Polignac number, because 198987841 - 2⁵ = 198987809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198987847) 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, 7653366 + ... + 7653391.

It is an arithmetic number, because the mean of its divisors is an integer number (53573653).

Almost surely, 2^198987841 is an apocalyptic number.

It is an amenable number.

198987841 is a deficient number, since it is larger than the sum of its proper divisors (15306771).

198987841 is a wasteful number, since it uses less digits than its factorization.

198987841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15306770.

The product of its digits is 1161216, while the sum is 55.

The square root of 198987841 is about 14106.3050087541. The cubic root of 198987841 is about 583.8153551265.

The spelling of 198987841 in words is "one hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred forty-one".