198970979 has 4 divisors (see below), whose sum is σ = 199052976. Its totient is φ = 198888984.

The previous prime is 198970969. The next prime is 198971011. The reversal of 198970979 is 979079891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979079891 = 2617 ⋅374123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198970979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198970939) 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, 37244 + ... + 42249.

It is an arithmetic number, because the mean of its divisors is an integer number (49763244).

Almost surely, 2^198970979 is an apocalyptic number.

198970979 is a deficient number, since it is larger than the sum of its proper divisors (81997).

198970979 is an equidigital number, since it uses as much as digits as its factorization.

198970979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81996.

The product of its (nonzero) digits is 2571912, while the sum is 59.

The square root of 198970979 is about 14105.7073200886. The cubic root of 198970979 is about 583.7988640475.

The spelling of 198970979 in words is "one hundred ninety-eight million, nine hundred seventy thousand, nine hundred seventy-nine".