1126639 has 4 divisors (see below), whose sum is σ = 1154160. Its totient is φ = 1099120.

The previous prime is 1126627. The next prime is 1126649. The reversal of 1126639 is 9366211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9366211 = 1033 ⋅9067.

It is a cyclic number.

It is not a de Polignac number, because 1126639 - 2¹⁵ = 1093871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1126649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13699 + ... + 13780.

It is an arithmetic number, because the mean of its divisors is an integer number (288540).

2^1126639 is an apocalyptic number.

1126639 is a deficient number, since it is larger than the sum of its proper divisors (27521).

1126639 is an equidigital number, since it uses as much as digits as its factorization.

1126639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27520.

The product of its digits is 1944, while the sum is 28.

The square root of 1126639 is about 1061.4325225845. The cubic root of 1126639 is about 104.0546741613.

The spelling of 1126639 in words is "one million, one hundred twenty-six thousand, six hundred thirty-nine".