1138992 has 40 divisors (see below), whose sum is σ = 2998320. Its totient is φ = 372480.

The previous prime is 1138987. The next prime is 1138997. The reversal of 1138992 is 2998311.

It is an interprime number because it is at equal distance from previous prime (1138987) and next prime (1138997).

It is not an unprimeable number, because it can be changed into a prime (1138997) 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 7 ways as a sum of consecutive naturals, for example, 2734 + ... + 3122.

It is an arithmetic number, because the mean of its divisors is an integer number (74958).

2^1138992 is an apocalyptic number.

1138992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499160).

1138992 is an abundant number, since it is smaller than the sum of its proper divisors (1859328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1138992 is a wasteful number, since it uses less digits than its factorization.

1138992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 455 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 1138992 is about 1067.2356815624. The cubic root of 1138992 is about 104.4335940978.

The spelling of 1138992 in words is "one million, one hundred thirty-eight thousand, nine hundred ninety-two".