199469891 has 8 divisors (see below), whose sum is σ = 213143040. Its totient is φ = 186012288.

The previous prime is 199469887. The next prime is 199469909. The reversal of 199469891 is 198964991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199469891 - 2² = 199469887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199469861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51971 + ... + 55676.

It is an arithmetic number, because the mean of its divisors is an integer number (26642880).

Almost surely, 2^199469891 is an apocalyptic number.

199469891 is a deficient number, since it is larger than the sum of its proper divisors (13673149).

199469891 is a wasteful number, since it uses less digits than its factorization.

199469891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107773.

The product of its digits is 1259712, while the sum is 56.

The square root of 199469891 is about 14123.3810045612. The cubic root of 199469891 is about 584.2864077659.

The spelling of 199469891 in words is "one hundred ninety-nine million, four hundred sixty-nine thousand, eight hundred ninety-one".