13381857 has 6 divisors (see below), whose sum is σ = 19329362. Its totient is φ = 8921232.

The previous prime is 13381853. The next prime is 13381859. The reversal of 13381857 is 75818331.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 5035536 = 2889^2 + 2244^2 .

It is not a de Polignac number, because 13381857 - 2² = 13381853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13381853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 743428 + ... + 743445.

Almost surely, 2^13381857 is an apocalyptic number.

It is an amenable number.

13381857 is a deficient number, since it is larger than the sum of its proper divisors (5947505).

13381857 is a wasteful number, since it uses less digits than its factorization.

13381857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486879 (or 1486876 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 13381857 is about 3658.1220591992. The cubic root of 13381857 is about 237.4135278920.

The spelling of 13381857 in words is "thirteen million, three hundred eighty-one thousand, eight hundred fifty-seven".