13849523857 has 8 divisors (see below), whose sum is σ = 14940728936. Its totient is φ = 12762012672.

The previous prime is 13849523827. The next prime is 13849523867. The reversal of 13849523857 is 75832594831.

It is a Cunningham number, because it is equal to 117684²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2048829696 + 11800694161 = 45264^2 + 108631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13849523857 - 2⁷ = 13849523729 is a prime.

It is a super-2 number, since 2×13849523857² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13849523798 and 13849523807.

It is not an unprimeable number, because it can be changed into a prime (13849523827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 915678 + ... + 930679.

It is an arithmetic number, because the mean of its divisors is an integer number (1867591117).

Almost surely, 2^13849523857 is an apocalyptic number.

It is an amenable number.

13849523857 is a deficient number, since it is larger than the sum of its proper divisors (1091205079).

13849523857 is a wasteful number, since it uses less digits than its factorization.

13849523857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846947.

The product of its digits is 7257600, while the sum is 55.

The spelling of 13849523857 in words is "thirteen billion, eight hundred forty-nine million, five hundred twenty-three thousand, eight hundred fifty-seven".