1223779 has 4 divisors (see below), whose sum is σ = 1295784. Its totient is φ = 1151776.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223779 is 9773221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1223779 - 2¹ = 1223777 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1223779.

It is not an unprimeable number, because it can be changed into a prime (1223773) 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, 35977 + ... + 36010.

It is an arithmetic number, because the mean of its divisors is an integer number (323946).

2^1223779 is an apocalyptic number.

1223779 is a deficient number, since it is larger than the sum of its proper divisors (72005).

1223779 is an equidigital number, since it uses as much as digits as its factorization.

1223779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72004.

The product of its digits is 5292, while the sum is 31.

The square root of 1223779 is about 1106.2454519681. The cubic root of 1223779 is about 106.9631864506.

It can be divided in two parts, 1223 and 779, that added together give a palindrome (2002).

The spelling of 1223779 in words is "one million, two hundred twenty-three thousand, seven hundred seventy-nine".