1242723 has 4 divisors (see below), whose sum is σ = 1656968. Its totient is φ = 828480.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242723 is 3272421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3272421 = 3 ⋅1090807.

It is not a de Polignac number, because 1242723 - 2¹⁰ = 1241699 is a prime.

It is a d-powerful number, because it can be written as 1 + 2⁸ + 4² + 2¹⁴ + 7³ + 2²⁰ + 3¹¹ .

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242723.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242763) 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, 207118 + ... + 207123.

It is an arithmetic number, because the mean of its divisors is an integer number (414242).

2^1242723 is an apocalyptic number.

1242723 is a deficient number, since it is larger than the sum of its proper divisors (414245).

1242723 is an equidigital number, since it uses as much as digits as its factorization.

1242723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414244.

The product of its digits is 672, while the sum is 21.

The square root of 1242723 is about 1114.7748651634. The cubic root of 1242723 is about 107.5122899235.

It can be divided in two parts, 124272 and 3, that multiplied together give a triangular number (372816 = T₈₆₃).

The spelling of 1242723 in words is "one million, two hundred forty-two thousand, seven hundred twenty-three".