199107893 has 4 divisors (see below), whose sum is σ = 210820140. Its totient is φ = 187395648.

The previous prime is 199107851. The next prime is 199107899. The reversal of 199107893 is 398701991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 398701991 = 71 ⋅5615521.

It can be written as a sum of positive squares in 2 ways, for example, as 58874929 + 140232964 = 7673^2 + 11842^2 .

It is a cyclic number.

It is not a de Polignac number, because 199107893 - 2¹⁴ = 199091509 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 (199107899) 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, 5856098 + ... + 5856131.

It is an arithmetic number, because the mean of its divisors is an integer number (52705035).

Almost surely, 2^199107893 is an apocalyptic number.

It is an amenable number.

199107893 is a deficient number, since it is larger than the sum of its proper divisors (11712247).

199107893 is a wasteful number, since it uses less digits than its factorization.

199107893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11712246.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 199107893 is about 14110.5596274563. The cubic root of 199107893 is about 583.9327393686.

The spelling of 199107893 in words is "one hundred ninety-nine million, one hundred seven thousand, eight hundred ninety-three".