1261723 has 4 divisors (see below), whose sum is σ = 1335960. Its totient is φ = 1187488.

The previous prime is 1261721. The next prime is 1261739. The reversal of 1261723 is 3271621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3271621 = 1721 ⋅1901.

It is a cyclic number.

It is not a de Polignac number, because 1261723 - 2¹ = 1261721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261694 and 1261703.

It is not an unprimeable number, because it can be changed into a prime (1261721) 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, 37093 + ... + 37126.

It is an arithmetic number, because the mean of its divisors is an integer number (333990).

2^1261723 is an apocalyptic number.

1261723 is a deficient number, since it is larger than the sum of its proper divisors (74237).

1261723 is an equidigital number, since it uses as much as digits as its factorization.

1261723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74236.

The product of its digits is 504, while the sum is 22.

The square root of 1261723 is about 1123.2644390347. The cubic root of 1261723 is about 108.0574397242.

It can be divided in two parts, 126 and 1723, that added together give a square (1849 = 43²).

The spelling of 1261723 in words is "one million, two hundred sixty-one thousand, seven hundred twenty-three".