1140391 has 8 divisors (see below), whose sum is σ = 1317024. Its totient is φ = 967200.

The previous prime is 1140389. The next prime is 1140413. The reversal of 1140391 is 1930411.

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 1140391 - 2¹ = 1140389 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 (1140311) 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 7 ways as a sum of consecutive naturals, for example, 100 + ... + 1513.

It is an arithmetic number, because the mean of its divisors is an integer number (164628).

2^1140391 is an apocalyptic number.

1140391 is a deficient number, since it is larger than the sum of its proper divisors (176633).

1140391 is a wasteful number, since it uses less digits than its factorization.

1140391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1140391 is about 1067.8909120317. The cubic root of 1140391 is about 104.4763344684.

The spelling of 1140391 in words is "one million, one hundred forty thousand, three hundred ninety-one".