11878891 has 2 divisors, whose sum is σ = 11878892. Its totient is φ = 11878890.

The previous prime is 11878873. The next prime is 11878927. The reversal of 11878891 is 19887811.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11878891 is a prime.

It is a super-2 number, since 2×11878891² = 282216102779762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11878861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5939445 + 5939446.

It is an arithmetic number, because the mean of its divisors is an integer number (5939446).

Almost surely, 2^11878891 is an apocalyptic number.

11878891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11878891 is an equidigital number, since it uses as much as digits as its factorization.

11878891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 43.

The square root of 11878891 is about 3446.5767074011. The cubic root of 11878891 is about 228.1700472997.

It can be divided in two parts, 11878 and 891, that added together give a square (12769 = 113²).

The spelling of 11878891 in words is "eleven million, eight hundred seventy-eight thousand, eight hundred ninety-one".