1139831 has 16 divisors (see below), whose sum is σ = 1444608. Its totient is φ = 873600.

The previous prime is 1139819. The next prime is 1139843. The reversal of 1139831 is 1389311.

It is an interprime number because it is at equal distance from previous prime (1139819) and next prime (1139843).

It is a de Polignac number, because none of the positive numbers 2^k-1139831 is a prime.

It is a super-2 number, since 2×1139831² = 2598429417122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1139831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139851) 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 15 ways as a sum of consecutive naturals, for example, 8636 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (90288).

2^1139831 is an apocalyptic number.

1139831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1139831 is a deficient number, since it is larger than the sum of its proper divisors (304777).

1139831 is a wasteful number, since it uses less digits than its factorization.

1139831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its digits is 648, while the sum is 26.

The square root of 1139831 is about 1067.6286807687. The cubic root of 1139831 is about 104.4592302978.

The spelling of 1139831 in words is "one million, one hundred thirty-nine thousand, eight hundred thirty-one".