1279723 has 4 divisors (see below), whose sum is σ = 1309528. Its totient is φ = 1249920.

The previous prime is 1279703. The next prime is 1279727. The reversal of 1279723 is 3279721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3279721 = 1811².

It is a cyclic number.

It is not a de Polignac number, because 1279723 - 2⁹ = 1279211 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹⁷ + 7⁵ + 9² + 7⁷ + 2¹⁷ + 3¹¹ .

It is a Duffinian number.

1279723 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1279727) 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, 14838 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (327382).

2^1279723 is an apocalyptic number.

1279723 is a deficient number, since it is larger than the sum of its proper divisors (29805).

1279723 is an equidigital number, since it uses as much as digits as its factorization.

1279723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29804.

The product of its digits is 5292, while the sum is 31.

The square root of 1279723 is about 1131.2484254133. The cubic root of 1279723 is about 108.5688718729.

It can be divided in two parts, 1279 and 723, that added together give a palindrome (2002).

The spelling of 1279723 in words is "one million, two hundred seventy-nine thousand, seven hundred twenty-three".