1138643 has 8 divisors (see below), whose sum is σ = 1315440. Its totient is φ = 974080.

The previous prime is 1138639. The next prime is 1138649. The reversal of 1138643 is 3468311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1138643 - 2² = 1138639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138649) 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 7 ways as a sum of consecutive naturals, for example, 2858 + ... + 3231.

It is an arithmetic number, because the mean of its divisors is an integer number (164430).

2^1138643 is an apocalyptic number.

1138643 is a deficient number, since it is larger than the sum of its proper divisors (176797).

1138643 is a wasteful number, since it uses less digits than its factorization.

1138643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6117.

The product of its digits is 1728, while the sum is 26.

The square root of 1138643 is about 1067.0721625082. The cubic root of 1138643 is about 104.4229264643.

The spelling of 1138643 in words is "one million, one hundred thirty-eight thousand, six hundred forty-three".