1138689 has 12 divisors (see below), whose sum is σ = 1731600. Its totient is φ = 719064.

The previous prime is 1138681. The next prime is 1138703. The reversal of 1138689 is 9868311.

It is not a de Polignac number, because 1138689 - 2³ = 1138681 is a prime.

It is a super-2 number, since 2×1138689² = 2593225277442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1138681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3159 + ... + 3500.

It is an arithmetic number, because the mean of its divisors is an integer number (144300).

It is a Proth number, since it is equal to 139 ⋅ 2¹³ + 1 and 139 < 2¹³.

2^1138689 is an apocalyptic number.

1138689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1138689 is a deficient number, since it is larger than the sum of its proper divisors (592911).

1138689 is a wasteful number, since it uses less digits than its factorization.

1138689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684 (or 6681 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1138689 is about 1067.0937165966. The cubic root of 1138689 is about 104.4243326381.

The spelling of 1138689 in words is "one million, one hundred thirty-eight thousand, six hundred eighty-nine".