40985881 has 4 divisors (see below), whose sum is σ = 41115492. Its totient is φ = 40856272.

The previous prime is 40985851. The next prime is 40985887. The reversal of 40985881 is 18858904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 33235225 = 2784^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 40985881 - 2¹³ = 40977689 is a prime.

It is a super-2 number, since 2×40985881² = 3359684882692322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40985887) 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, 64330 + ... + 64963.

It is an arithmetic number, because the mean of its divisors is an integer number (10278873).

Almost surely, 2^40985881 is an apocalyptic number.

It is an amenable number.

40985881 is a deficient number, since it is larger than the sum of its proper divisors (129611).

40985881 is a wasteful number, since it uses less digits than its factorization.

40985881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129610.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 40985881 is about 6402.0216338279. The cubic root of 40985881 is about 344.7821378848.

The spelling of 40985881 in words is "forty million, nine hundred eighty-five thousand, eight hundred eighty-one".