1223931 has 4 divisors (see below), whose sum is σ = 1631912. Its totient is φ = 815952.

The previous prime is 1223921. The next prime is 1223939. The reversal of 1223931 is 1393221.

It is a happy number.

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

It is not a de Polignac number, because 1223931 - 2⁶ = 1223867 is a prime.

It is a super-2 number, since 2×1223931² = 2996014185522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

1223931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1223898 and 1223907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203986 + ... + 203991.

It is an arithmetic number, because the mean of its divisors is an integer number (407978).

2^1223931 is an apocalyptic number.

1223931 is a deficient number, since it is larger than the sum of its proper divisors (407981).

1223931 is an equidigital number, since it uses as much as digits as its factorization.

1223931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407980.

The product of its digits is 324, while the sum is 21.

The square root of 1223931 is about 1106.3141506823. The cubic root of 1223931 is about 106.9676147369.

The spelling of 1223931 in words is "one million, two hundred twenty-three thousand, nine hundred thirty-one".