199840001 has 2 divisors, whose sum is σ = 199840002. Its totient is φ = 199840000.

The previous prime is 199839973. The next prime is 199840033. The reversal of 199840001 is 100048991.

It is an a-pointer prime, because the next prime (199840033) can be obtained adding 199840001 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142444225 + 57395776 = 11935^2 + 7576^2 .

It is a cyclic number.

It is not a de Polignac number, because 199840001 - 2¹⁸ = 199577857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199840001.

It is not a weakly prime, because it can be changed into another prime (199840061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99920000 + 99920001.

It is an arithmetic number, because the mean of its divisors is an integer number (99920001).

Almost surely, 2^199840001 is an apocalyptic number.

It is an amenable number.

199840001 is a deficient number, since it is larger than the sum of its proper divisors (1).

199840001 is an equidigital number, since it uses as much as digits as its factorization.

199840001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 199840001 is about 14136.4776730273. The cubic root of 199840001 is about 584.6475594005.

Adding to 199840001 its reverse (100048991), we get a palindrome (299888992).

The spelling of 199840001 in words is "one hundred ninety-nine million, eight hundred forty thousand, one".