40857581 has 4 divisors (see below), whose sum is σ = 43008000. Its totient is φ = 38707164.

The previous prime is 40857577. The next prime is 40857587. The reversal of 40857581 is 18575804.

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 40857581 - 2² = 40857577 is a prime.

It is a super-2 number, since 2×40857581² = 3338683850343122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40857587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075181 + ... + 1075218.

It is an arithmetic number, because the mean of its divisors is an integer number (10752000).

Almost surely, 2^40857581 is an apocalyptic number.

It is an amenable number.

40857581 is a deficient number, since it is larger than the sum of its proper divisors (2150419).

40857581 is a wasteful number, since it uses less digits than its factorization.

40857581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150418.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 40857581 is about 6391.9935075061. The cubic root of 40857581 is about 344.4219993429.

The spelling of 40857581 in words is "forty million, eight hundred fifty-seven thousand, five hundred eighty-one".