40981636 has 12 divisors (see below), whose sum is σ = 72933840. Its totient is φ = 20143400.

The previous prime is 40981631. The next prime is 40981657. The reversal of 40981636 is 63618904.

It is a junction number, because it is equal to n+sod(n) for n = 40981595 and 40981604.

It is not an unprimeable number, because it can be changed into a prime (40981631) 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, 86590 + ... + 87061.

It is an arithmetic number, because the mean of its divisors is an integer number (6077820).

Almost surely, 2^40981636 is an apocalyptic number.

It is an amenable number.

40981636 is a deficient number, since it is larger than the sum of its proper divisors (31952204).

40981636 is a wasteful number, since it uses less digits than its factorization.

40981636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173714 (or 173712 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 40981636 is about 6401.6900893436. The cubic root of 40981636 is about 344.7702341863.

The spelling of 40981636 in words is "forty million, nine hundred eighty-one thousand, six hundred thirty-six".