13724157 has 4 divisors (see below), whose sum is σ = 18298880. Its totient is φ = 9149436.

The previous prime is 13724149. The next prime is 13724171. The reversal of 13724157 is 75142731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75142731 = 3 ⋅25047577.

It is not a de Polignac number, because 13724157 - 2³ = 13724149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13724107) 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, 2287357 + ... + 2287362.

It is an arithmetic number, because the mean of its divisors is an integer number (4574720).

Almost surely, 2^13724157 is an apocalyptic number.

It is an amenable number.

13724157 is a deficient number, since it is larger than the sum of its proper divisors (4574723).

13724157 is an equidigital number, since it uses as much as digits as its factorization.

13724157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574722.

The product of its digits is 5880, while the sum is 30.

The square root of 13724157 is about 3704.6129352471. The cubic root of 13724157 is about 239.4208082225.

Adding to 13724157 its reverse (75142731), we get a palindrome (88866888).

The spelling of 13724157 in words is "thirteen million, seven hundred twenty-four thousand, one hundred fifty-seven".