1138881 has 16 divisors (see below), whose sum is σ = 1629504. Its totient is φ = 705024.

The previous prime is 1138867. The next prime is 1138883. The reversal of 1138881 is 1888311.

It is not a de Polignac number, because 1138881 - 2⁵ = 1138849 is a prime.

It is a super-2 number, since 2×1138881² = 2594099864322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6906 + ... + 7068.

It is an arithmetic number, because the mean of its divisors is an integer number (101844).

2^1138881 is an apocalyptic number.

It is an amenable number.

1138881 is a deficient number, since it is larger than the sum of its proper divisors (490623).

1138881 is a wasteful number, since it uses less digits than its factorization.

1138881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320.

The product of its digits is 1536, while the sum is 30.

The square root of 1138881 is about 1067.1836767867. The cubic root of 1138881 is about 104.4302014765.

The spelling of 1138881 in words is "one million, one hundred thirty-eight thousand, eight hundred eighty-one".