40945681 has 16 divisors (see below), whose sum is σ = 49065984. Its totient is φ = 33408144.

The previous prime is 40945679. The next prime is 40945687. The reversal of 40945681 is 18654904.

It is a happy number.

It is not a de Polignac number, because 40945681 - 2¹ = 40945679 is a prime.

It is a super-2 number, since 2×40945681² = 3353097585107522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40945681.

It is not an unprimeable number, because it can be changed into a prime (40945687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41860 + ... + 42826.

It is an arithmetic number, because the mean of its divisors is an integer number (3066624).

Almost surely, 2^40945681 is an apocalyptic number.

It is an amenable number.

40945681 is a deficient number, since it is larger than the sum of its proper divisors (8120303).

40945681 is a wasteful number, since it uses less digits than its factorization.

40945681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 40945681 is about 6398.8812303402. The cubic root of 40945681 is about 344.6693772985.

The spelling of 40945681 in words is "forty million, nine hundred forty-five thousand, six hundred eighty-one".