1199891 has 8 divisors (see below), whose sum is σ = 1496064. Its totient is φ = 934920.

The previous prime is 1199879. The next prime is 1199893. The reversal of 1199891 is 1989911.

1199891 = T₂₅₃ + T₂₅₄ + ... + T₂₈₅.

It is a happy number.

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

It is not a de Polignac number, because 1199891 - 2¹⁰ = 1198867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1199893) 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, 7715 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (187008).

2^1199891 is an apocalyptic number.

1199891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1199891 is a deficient number, since it is larger than the sum of its proper divisors (296173).

1199891 is a wasteful number, since it uses less digits than its factorization.

1199891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15601.

The product of its digits is 5832, while the sum is 38.

The square root of 1199891 is about 1095.3953624149. The cubic root of 1199891 is about 106.2626393268.

The spelling of 1199891 in words is "one million, one hundred ninety-nine thousand, eight hundred ninety-one".