199860973 has 4 divisors (see below), whose sum is σ = 215234908. Its totient is φ = 184487040.

The previous prime is 199860931. The next prime is 199861021. The reversal of 199860973 is 379068991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 379068991 = 7 ⋅54152713.

It can be written as a sum of positive squares in 2 ways, for example, as 63952009 + 135908964 = 7997^2 + 11658^2 .

It is a cyclic number.

It is not a de Polignac number, because 199860973 - 2²⁵ = 166306541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199860973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199860923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7686948 + ... + 7686973.

It is an arithmetic number, because the mean of its divisors is an integer number (53808727).

Almost surely, 2^199860973 is an apocalyptic number.

199860973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

199860973 is a deficient number, since it is larger than the sum of its proper divisors (15373935).

199860973 is a wasteful number, since it uses less digits than its factorization.

199860973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15373934.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 199860973 is about 14137.2194225031. The cubic root of 199860973 is about 584.6680104275.

The spelling of 199860973 in words is "one hundred ninety-nine million, eight hundred sixty thousand, nine hundred seventy-three".