40857 has 4 divisors (see below), whose sum is σ = 54480. Its totient is φ = 27236.

The previous prime is 40853. The next prime is 40867. The reversal of 40857 is 75804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40857 - 2² = 40853 is a prime.

It is a D-number.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 40857.

It is not an unprimeable number, because it can be changed into a prime (40853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6807 + ... + 6812.

It is an arithmetic number, because the mean of its divisors is an integer number (13620).

2⁴⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

40857 is a deficient number, since it is larger than the sum of its proper divisors (13623).

40857 is a wasteful number, since it uses less digits than its factorization.

40857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13622.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 40857 is about 202.1311455466. The cubic root of 40857 is about 34.4420366760.

It can be divided in two parts, 408 and 57, that added together give a triangular number (465 = T₃₀).

The spelling of 40857 in words is "forty thousand, eight hundred fifty-seven".