13439723 has 4 divisors (see below), whose sum is σ = 14661528. Its totient is φ = 12217920.

The previous prime is 13439689. The next prime is 13439737. The reversal of 13439723 is 32793431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32793431 = 11 ⋅2981221.

It is not a de Polignac number, because 13439723 - 2⁸ = 13439467 is a prime.

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 13439723.

It is not an unprimeable number, because it can be changed into a prime (13439743) 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, 610886 + ... + 610907.

It is an arithmetic number, because the mean of its divisors is an integer number (3665382).

Almost surely, 2^13439723 is an apocalyptic number.

13439723 is a deficient number, since it is larger than the sum of its proper divisors (1221805).

13439723 is a wasteful number, since it uses less digits than its factorization.

13439723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221804.

The product of its digits is 13608, while the sum is 32.

The square root of 13439723 is about 3666.0227767978. The cubic root of 13439723 is about 237.7552447001.

The spelling of 13439723 in words is "thirteen million, four hundred thirty-nine thousand, seven hundred twenty-three".