199901847 has 4 divisors (see below), whose sum is σ = 266535800. Its totient is φ = 133267896.

The previous prime is 199901833. The next prime is 199901851. The reversal of 199901847 is 748109991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748109991 = 3 ⋅249369997.

It is not a de Polignac number, because 199901847 - 2⁸ = 199901591 is a prime.

It is a super-2 number, since 2×199901847² = 79921496868022818, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199901796 and 199901805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199901347) 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, 33316972 + ... + 33316977.

It is an arithmetic number, because the mean of its divisors is an integer number (66633950).

Almost surely, 2^199901847 is an apocalyptic number.

199901847 is a deficient number, since it is larger than the sum of its proper divisors (66633953).

199901847 is an equidigital number, since it uses as much as digits as its factorization.

199901847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66633952.

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 199901847 is about 14138.6649652646. The cubic root of 199901847 is about 584.7078649506.

The spelling of 199901847 in words is "one hundred ninety-nine million, nine hundred one thousand, eight hundred forty-seven".