199819453 has 4 divisors (see below), whose sum is σ = 199863100. Its totient is φ = 199775808.

The previous prime is 199819439. The next prime is 199819471. The reversal of 199819453 is 354918991.

199819453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354918991 = 7 ⋅50702713.

It can be written as a sum of positive squares in 2 ways, for example, as 32970564 + 166848889 = 5742^2 + 12917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199819453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199819397 and 199819406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199819553) 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, 14028 + ... + 24421.

It is an arithmetic number, because the mean of its divisors is an integer number (49965775).

Almost surely, 2^199819453 is an apocalyptic number.

It is an amenable number.

199819453 is a deficient number, since it is larger than the sum of its proper divisors (43647).

199819453 is an equidigital number, since it uses as much as digits as its factorization.

199819453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43646.

The product of its digits is 349920, while the sum is 49.

The square root of 199819453 is about 14135.7508820720. The cubic root of 199819453 is about 584.6275204531.

The spelling of 199819453 in words is "one hundred ninety-nine million, eight hundred nineteen thousand, four hundred fifty-three".