1118639 has 4 divisors (see below), whose sum is σ = 1121424. Its totient is φ = 1115856.

The previous prime is 1118629. The next prime is 1118653. The reversal of 1118639 is 9368111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9368111 = 1483 ⋅6317.

It is a cyclic number.

It is not a de Polignac number, because 1118639 - 2¹⁶ = 1053103 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662 + ... + 1635.

It is an arithmetic number, because the mean of its divisors is an integer number (280356).

2^1118639 is an apocalyptic number.

1118639 is a deficient number, since it is larger than the sum of its proper divisors (2785).

1118639 is an equidigital number, since it uses as much as digits as its factorization.

1118639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784.

The product of its digits is 1296, while the sum is 29.

The square root of 1118639 is about 1057.6573169037. The cubic root of 1118639 is about 103.8077996028.

The spelling of 1118639 in words is "one million, one hundred eighteen thousand, six hundred thirty-nine".