1138891 has 12 divisors (see below), whose sum is σ = 1291248. Its totient is φ = 1002144.

The previous prime is 1138883. The next prime is 1138901. The reversal of 1138891 is 1988311.

It is not a de Polignac number, because 1138891 - 2³ = 1138883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3741 + ... + 4033.

It is an arithmetic number, because the mean of its divisors is an integer number (107604).

2^1138891 is an apocalyptic number.

1138891 is a deficient number, since it is larger than the sum of its proper divisors (152357).

1138891 is a wasteful number, since it uses less digits than its factorization.

1138891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 329 counting only the distinct ones).

The product of its digits is 1728, while the sum is 31.

The square root of 1138891 is about 1067.1883620055. The cubic root of 1138891 is about 104.4305071271.

The spelling of 1138891 in words is "one million, one hundred thirty-eight thousand, eight hundred ninety-one".