109857 has 8 divisors (see below), whose sum is σ = 159840. Its totient is φ = 66560.

The previous prime is 109849. The next prime is 109859. The reversal of 109857 is 758901.

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 109857 - 2³ = 109849 is a prime.

109857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (109859) 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, 1632 + ... + 1697.

It is an arithmetic number, because the mean of its divisors is an integer number (19980).

2¹⁰⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

109857 is a deficient number, since it is larger than the sum of its proper divisors (49983).

109857 is a wasteful number, since it uses less digits than its factorization.

109857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 109857 is about 331.4468283149. The cubic root of 109857 is about 47.8934267475.

The spelling of 109857 in words is "one hundred nine thousand, eight hundred fifty-seven".