1165399 has 2 divisors, whose sum is σ = 1165400. Its totient is φ = 1165398.

The previous prime is 1165397. The next prime is 1165421. The reversal of 1165399 is 9935611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165399 - 2¹ = 1165397 is a prime.

Together with 1165397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582699 + 582700.

It is an arithmetic number, because the mean of its divisors is an integer number (582700).

2^1165399 is an apocalyptic number.

1165399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165399 is an equidigital number, since it uses as much as digits as its factorization.

1165399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 34.

The square root of 1165399 is about 1079.5364746038. The cubic root of 1165399 is about 105.2345173879.

The spelling of 1165399 in words is "one million, one hundred sixty-five thousand, three hundred ninety-nine".