198607919 has 4 divisors (see below), whose sum is σ = 200430120. Its totient is φ = 196785720.

The previous prime is 198607901. The next prime is 198607949. The reversal of 198607919 is 919706891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198607919 is a prime.

It is a super-2 number, since 2×198607919² = 78890210979021122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198607949) 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, 910937 + ... + 911154.

It is an arithmetic number, because the mean of its divisors is an integer number (50107530).

Almost surely, 2^198607919 is an apocalyptic number.

198607919 is a deficient number, since it is larger than the sum of its proper divisors (1822201).

198607919 is a wasteful number, since it uses less digits than its factorization.

198607919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822200.

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 198607919 is about 14092.8321851926. The cubic root of 198607919 is about 583.4435642208.

The spelling of 198607919 in words is "one hundred ninety-eight million, six hundred seven thousand, nine hundred nineteen".