1223905 has 4 divisors (see below), whose sum is σ = 1468692. Its totient is φ = 979120.

The previous prime is 1223897. The next prime is 1223921. The reversal of 1223905 is 5093221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 156816 + 1067089 = 396^2 + 1033^2 .

It is not a de Polignac number, because 1223905 - 2³ = 1223897 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122386 + ... + 122395.

It is an arithmetic number, because the mean of its divisors is an integer number (367173).

2^1223905 is an apocalyptic number.

It is an amenable number.

1223905 is a deficient number, since it is larger than the sum of its proper divisors (244787).

1223905 is an equidigital number, since it uses as much as digits as its factorization.

1223905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244786.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1223905 is about 1106.3023998889. The cubic root of 1223905 is about 106.9668572928.

The spelling of 1223905 in words is "one million, two hundred twenty-three thousand, nine hundred five".