40086581 has 4 divisors (see below), whose sum is σ = 40135200. Its totient is φ = 40037964.

The previous prime is 40086559. The next prime is 40086583. The reversal of 40086581 is 18568004.

40086581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40086581 - 2⁶ = 40086517 is a prime.

It is a super-2 number, since 2×40086581² = 3213867952539122, 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 (40086583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23051 + ... + 24728.

It is an arithmetic number, because the mean of its divisors is an integer number (10033800).

Almost surely, 2^40086581 is an apocalyptic number.

It is an amenable number.

40086581 is a deficient number, since it is larger than the sum of its proper divisors (48619).

40086581 is an equidigital number, since it uses as much as digits as its factorization.

40086581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48618.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 40086581 is about 6331.3964494415. The cubic root of 40086581 is about 342.2417638943.

The spelling of 40086581 in words is "forty million, eighty-six thousand, five hundred eighty-one".