13999857 has 16 divisors (see below), whose sum is σ = 19855872. Its totient is φ = 8743680.

The previous prime is 13999831. The next prime is 13999871. The reversal of 13999857 is 75899931.

It is a happy number.

It is not a de Polignac number, because 13999857 - 2⁷ = 13999729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (13999877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13632 + ... + 14622.

It is an arithmetic number, because the mean of its divisors is an integer number (1240992).

Almost surely, 2^13999857 is an apocalyptic number.

13999857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13999857 is a deficient number, since it is larger than the sum of its proper divisors (5856015).

13999857 is a wasteful number, since it uses less digits than its factorization.

13999857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288.

The product of its digits is 612360, while the sum is 51.

The square root of 13999857 is about 3741.6382775463. The cubic root of 13999857 is about 241.0134058187.

The spelling of 13999857 in words is "thirteen million, nine hundred ninety-nine thousand, eight hundred fifty-seven".