40663881 has 24 divisors (see below), whose sum is σ = 63225864. Its totient is φ = 25090560.

The previous prime is 40663873. The next prime is 40663891. The reversal of 40663881 is 18836604.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13571856 + 27092025 = 3684^2 + 5205^2 .

It is not a de Polignac number, because 40663881 - 2³ = 40663873 is a prime.

It is a super-2 number, since 2×40663881² = 3307102435964322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40663811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7155 + ... + 11511.

It is an arithmetic number, because the mean of its divisors is an integer number (2634411).

Almost surely, 2^40663881 is an apocalyptic number.

It is an amenable number.

40663881 is a deficient number, since it is larger than the sum of its proper divisors (22561983).

40663881 is a wasteful number, since it uses less digits than its factorization.

40663881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4438 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 40663881 is about 6376.8237391353. The cubic root of 40663881 is about 343.8768516514.

The spelling of 40663881 in words is "forty million, six hundred sixty-three thousand, eight hundred eighty-one".