40731881 has 8 divisors (see below), whose sum is σ = 43445160. Its totient is φ = 38053888.

The previous prime is 40731871. The next prime is 40731893. The reversal of 40731881 is 18813704.

40731881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1731856 + 39000025 = 1316^2 + 6245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40731881 - 2¹⁰ = 40730857 is a prime.

It is a super-2 number, since 2×40731881² = 3318172259596322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40731841) 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 7 ways as a sum of consecutive naturals, for example, 6416 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (5430645).

Almost surely, 2^40731881 is an apocalyptic number.

It is an amenable number.

40731881 is a deficient number, since it is larger than the sum of its proper divisors (2713279).

40731881 is a wasteful number, since it uses less digits than its factorization.

40731881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17643.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 40731881 is about 6382.1533200010. The cubic root of 40731881 is about 344.0684270990.

The spelling of 40731881 in words is "forty million, seven hundred thirty-one thousand, eight hundred eighty-one".