198412979 has 4 divisors (see below), whose sum is σ = 201207600. Its totient is φ = 195618360.

The previous prime is 198412969. The next prime is 198412997. The reversal of 198412979 is 979214891.

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-198412979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198412919) 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, 1397204 + ... + 1397345.

It is an arithmetic number, because the mean of its divisors is an integer number (50301900).

Almost surely, 2^198412979 is an apocalyptic number.

198412979 is a deficient number, since it is larger than the sum of its proper divisors (2794621).

198412979 is an equidigital number, since it uses as much as digits as its factorization.

198412979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794620.

The product of its digits is 326592, while the sum is 50.

The square root of 198412979 is about 14085.9142053329. The cubic root of 198412979 is about 583.2526122499.

The spelling of 198412979 in words is "one hundred ninety-eight million, four hundred twelve thousand, nine hundred seventy-nine".