13857849 has 12 divisors (see below), whose sum is σ = 20085312. Its totient is φ = 9207000.

The previous prime is 13857841. The next prime is 13857871. The reversal of 13857849 is 94875831.

13857849 is a `hidden beast` number, since 1 + 38 + 578 + 49 = 666.

It is not a de Polignac number, because 13857849 - 2³ = 13857841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13857841) 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 11 ways as a sum of consecutive naturals, for example, 324 + ... + 5274.

It is an arithmetic number, because the mean of its divisors is an integer number (1673776).

Almost surely, 2^13857849 is an apocalyptic number.

It is an amenable number.

13857849 is a deficient number, since it is larger than the sum of its proper divisors (6227463).

13857849 is a wasteful number, since it uses less digits than its factorization.

13857849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5268 (or 5265 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 13857849 is about 3722.6131950553. The cubic root of 13857849 is about 240.1957257542.

It can be divided in two parts, 13857 and 849, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 13857849 in words is "thirteen million, eight hundred fifty-seven thousand, eight hundred forty-nine".