199320979 has 16 divisors (see below), whose sum is σ = 241726464. Its totient is φ = 161863200.

The previous prime is 199320949. The next prime is 199320983. The reversal of 199320979 is 979023991.

199320979 = 37² + 38² + ... + 842².

It is a cyclic number.

It is not a de Polignac number, because 199320979 - 2⁷ = 199320851 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (199320949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18049 + ... + 26914.

It is an arithmetic number, because the mean of its divisors is an integer number (15107904).

Almost surely, 2^199320979 is an apocalyptic number.

199320979 is a deficient number, since it is larger than the sum of its proper divisors (42405485).

199320979 is a wasteful number, since it uses less digits than its factorization.

199320979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45018.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 199320979 is about 14118.1081947972. The cubic root of 199320979 is about 584.1409740908.

The spelling of 199320979 in words is "one hundred ninety-nine million, three hundred twenty thousand, nine hundred seventy-nine".