1223791 has 4 divisors (see below), whose sum is σ = 1227400. Its totient is φ = 1220184.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223791 is 1973221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1973221 = 191 ⋅10331.

It is a cyclic number.

It is not a de Polignac number, because 1223791 - 2⁹ = 1223279 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 (1223731) 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, 1236 + ... + 1993.

It is an arithmetic number, because the mean of its divisors is an integer number (306850).

2^1223791 is an apocalyptic number.

1223791 is a deficient number, since it is larger than the sum of its proper divisors (3609).

1223791 is an equidigital number, since it uses as much as digits as its factorization.

1223791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608.

The product of its digits is 756, while the sum is 25.

The square root of 1223791 is about 1106.2508757059. The cubic root of 1223791 is about 106.9635360655.

The spelling of 1223791 in words is "one million, two hundred twenty-three thousand, seven hundred ninety-one".