199841371400389 has 4 divisors (see below), whose sum is σ = 199844128171756. Its totient is φ = 199838614629024.

The previous prime is 199841371400353. The next prime is 199841371400399. The reversal of 199841371400389 is 983004173148991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139089354768225 + 60752016632164 = 11793615^2 + 7794358^2 .

It is a cyclic number.

It is not a de Polignac number, because 199841371400389 - 2¹⁹ = 199841370876101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199841371400399) 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, 1378276944 + ... + 1378421929.

It is an arithmetic number, because the mean of its divisors is an integer number (49961032042939).

Almost surely, 2^{199841371400389} is an apocalyptic number.

It is an amenable number.

199841371400389 is a deficient number, since it is larger than the sum of its proper divisors (2756771367).

199841371400389 is an equidigital number, since it uses as much as digits as its factorization.

199841371400389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756771366.

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 199841371400389 in words is "one hundred ninety-nine trillion, eight hundred forty-one billion, three hundred seventy-one million, four hundred thousand, three hundred eighty-nine".