1231722 has 24 divisors (see below), whose sum is σ = 2735460. Its totient is φ = 400320.

The previous prime is 1231721. The next prime is 1231733. The reversal of 1231722 is 2271321.

It can be written as a sum of positive squares in 2 ways, for example, as 1147041 + 84681 = 1071^2 + 291^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1231695 and 1231704.

It is not an unprimeable number, because it can be changed into a prime (1231721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97 + ... + 1572.

2^1231722 is an apocalyptic number.

1231722 is an abundant number, since it is smaller than the sum of its proper divisors (1503738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231722 is a wasteful number, since it uses less digits than its factorization.

1231722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718 (or 1715 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 1231722 is about 1109.8297166683. The cubic root of 1231722 is about 107.1941042462.

It can be divided in two parts, 1231 and 722, that added together give a triangular number (1953 = T₆₂).

The spelling of 1231722 in words is "one million, two hundred thirty-one thousand, seven hundred twenty-two".