13872157 has 6 divisors (see below), whose sum is σ = 14953722. Its totient is φ = 12792672.

The previous prime is 13872137. The next prime is 13872169. The reversal of 13872157 is 75127831.

It can be written as a sum of positive squares in 3 ways, for example, as 7080921 + 6791236 = 2661^2 + 2606^2 .

It is not a de Polignac number, because 13872157 - 2⁷ = 13872029 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 (13872107) 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 5 ways as a sum of consecutive naturals, for example, 12913 + ... + 13945.

It is an arithmetic number, because the mean of its divisors is an integer number (2492287).

Almost surely, 2^13872157 is an apocalyptic number.

It is an amenable number.

13872157 is a deficient number, since it is larger than the sum of its proper divisors (1081565).

13872157 is an frugal number, since it uses more digits than its factorization.

13872157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079 (or 1046 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 13872157 is about 3724.5344675543. The cubic root of 13872157 is about 240.2783633588.

Adding to 13872157 its reverse (75127831), we get a palindrome (88999988).

It can be divided in two parts, 138721 and 57, that multiplied together give a palindrome (7907097).

The spelling of 13872157 in words is "thirteen million, eight hundred seventy-two thousand, one hundred fifty-seven".