1091423 has 4 divisors (see below), whose sum is σ = 1106448. Its totient is φ = 1076400.

The previous prime is 1091413. The next prime is 1091443. The reversal of 1091423 is 3241901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3241901 = 13 ⋅249377.

It is a cyclic number.

It is not a de Polignac number, because 1091423 - 2⁶ = 1091359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1091395 and 1091404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091413) 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, 7403 + ... + 7548.

It is an arithmetic number, because the mean of its divisors is an integer number (276612).

2^1091423 is an apocalyptic number.

1091423 is a deficient number, since it is larger than the sum of its proper divisors (15025).

1091423 is an equidigital number, since it uses as much as digits as its factorization.

1091423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15024.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1091423 is about 1044.7119220149. The cubic root of 1091423 is about 102.9590121893.

The spelling of 1091423 in words is "one million, ninety-one thousand, four hundred twenty-three".