1166399 has 16 divisors (see below), whose sum is σ = 1354752. Its totient is φ = 995808.

The previous prime is 1166393. The next prime is 1166401. The reversal of 1166399 is 9936611.

It is a Cunningham number, because it is equal to 1080²-1.

It is not a de Polignac number, because 1166399 - 2⁴ = 1166383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14012 + ... + 14094.

It is an arithmetic number, because the mean of its divisors is an integer number (84672).

2^1166399 is an apocalyptic number.

1166399 is a deficient number, since it is larger than the sum of its proper divisors (188353).

1166399 is a wasteful number, since it uses less digits than its factorization.

1166399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166.

The product of its digits is 8748, while the sum is 35.

The square root of 1166399 is about 1079.9995370369. Note that the first 3 decimals coincide. The cubic root of 1166399 is about 105.2646084932.

The spelling of 1166399 in words is "one million, one hundred sixty-six thousand, three hundred ninety-nine".