199866457 has 4 divisors (see below), whose sum is σ = 228418816. Its totient is φ = 171314100.

The previous prime is 199866449. The next prime is 199866461. The reversal of 199866457 is 754668991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199866457 - 2³ = 199866449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199866398 and 199866407.

It is not an unprimeable number, because it can be changed into a prime (199866437) 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, 14276169 + ... + 14276182.

It is an arithmetic number, because the mean of its divisors is an integer number (57104704).

Almost surely, 2^199866457 is an apocalyptic number.

It is an amenable number.

199866457 is a deficient number, since it is larger than the sum of its proper divisors (28552359).

199866457 is an equidigital number, since it uses as much as digits as its factorization.

199866457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28552358.

The product of its digits is 3265920, while the sum is 55.

The square root of 199866457 is about 14137.4133772766. The cubic root of 199866457 is about 584.6733579615.

The spelling of 199866457 in words is "one hundred ninety-nine million, eight hundred sixty-six thousand, four hundred fifty-seven".