199847723 has 2 divisors, whose sum is σ = 199847724. Its totient is φ = 199847722.

The previous prime is 199847663. The next prime is 199847743. The reversal of 199847723 is 327748991.

It is a strong prime.

It is an emirp because it is prime and its reverse (327748991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199847723 - 2¹⁸ = 199585579 is a prime.

It is a super-2 number, since 2×199847723² = 79878224776569458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199847743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99923861 + 99923862.

It is an arithmetic number, because the mean of its divisors is an integer number (99923862).

Almost surely, 2^199847723 is an apocalyptic number.

199847723 is a deficient number, since it is larger than the sum of its proper divisors (1).

199847723 is an equidigital number, since it uses as much as digits as its factorization.

199847723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 199847723 is about 14136.7507935876. The cubic root of 199847723 is about 584.6550897419.

The spelling of 199847723 in words is "one hundred ninety-nine million, eight hundred forty-seven thousand, seven hundred twenty-three".