1138631 has 4 divisors (see below), whose sum is σ = 1226232. Its totient is φ = 1051032.

The previous prime is 1138591. The next prime is 1138637. The reversal of 1138631 is 1368311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1138631 - 2⁶ = 1138567 is a prime.

It is a super-2 number, since 2×1138631² = 2592961108322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1138597 and 1138606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43781 + ... + 43806.

It is an arithmetic number, because the mean of its divisors is an integer number (306558).

2^1138631 is an apocalyptic number.

1138631 is a deficient number, since it is larger than the sum of its proper divisors (87601).

1138631 is an equidigital number, since it uses as much as digits as its factorization.

1138631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87600.

The product of its digits is 432, while the sum is 23.

The square root of 1138631 is about 1067.0665396310. The cubic root of 1138631 is about 104.4225596301.

The spelling of 1138631 in words is "one million, one hundred thirty-eight thousand, six hundred thirty-one".