1208891 has 4 divisors (see below), whose sum is σ = 1214400. Its totient is φ = 1203384.

The previous prime is 1208873. The next prime is 1208927. The reversal of 1208891 is 1988021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1988021 = 7 ⋅284003.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1208891 is a prime.

It is a super-2 number, since 2×1208891² = 2922834899762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1208821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2411 + ... + 2868.

It is an arithmetic number, because the mean of its divisors is an integer number (303600).

2^1208891 is an apocalyptic number.

1208891 is a deficient number, since it is larger than the sum of its proper divisors (5509).

1208891 is an equidigital number, since it uses as much as digits as its factorization.

1208891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1208891 is about 1099.4957935345. The cubic root of 1208891 is about 106.5276585499.

The spelling of 1208891 in words is "one million, two hundred eight thousand, eight hundred ninety-one".