1126391 has 8 divisors (see below), whose sum is σ = 1322400. Its totient is φ = 939168.

The previous prime is 1126387. The next prime is 1126397. The reversal of 1126391 is 1936211.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1126391 - 2² = 1126387 is a prime.

It is a super-3 number, since 3×1126391³ = 4287348333119383413, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1126397) 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, 1916 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (165300).

2^1126391 is an apocalyptic number.

1126391 is a deficient number, since it is larger than the sum of its proper divisors (196009).

1126391 is an equidigital number, since it uses as much as digits as its factorization.

1126391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393.

The product of its digits is 324, while the sum is 23.

The square root of 1126391 is about 1061.3156929020. The cubic root of 1126391 is about 104.0470386327.

The spelling of 1126391 in words is "one million, one hundred twenty-six thousand, three hundred ninety-one".