40217881 has 16 divisors (see below), whose sum is σ = 46080000. Its totient is φ = 34765200.

The previous prime is 40217833. The next prime is 40217909. The reversal of 40217881 is 18871204.

40217881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40217881 is a prime.

It is a super-2 number, since 2×40217881² = 3234955904260322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40217581) 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 15 ways as a sum of consecutive naturals, for example, 19120 + ... + 21118.

It is an arithmetic number, because the mean of its divisors is an integer number (2880000).

Almost surely, 2^40217881 is an apocalyptic number.

It is an amenable number.

40217881 is a deficient number, since it is larger than the sum of its proper divisors (5862119).

40217881 is a wasteful number, since it uses less digits than its factorization.

40217881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 40217881 is about 6341.7569332165. The cubic root of 40217881 is about 342.6150174030.

The spelling of 40217881 in words is "forty million, two hundred seventeen thousand, eight hundred eighty-one".