40366665 has 24 divisors (see below), whose sum is σ = 70174728. Its totient is φ = 21465600.

The previous prime is 40366661. The next prime is 40366691. The reversal of 40366665 is 56666304.

It can be written as a sum of positive squares in 4 ways, for example, as 21678336 + 18688329 = 4656^2 + 4323^2 .

It is not a de Polignac number, because 40366665 - 2² = 40366661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40366661) 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, 16927 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (2923947).

Almost surely, 2^40366665 is an apocalyptic number.

40366665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40366665 is a deficient number, since it is larger than the sum of its proper divisors (29808063).

40366665 is a wasteful number, since it uses less digits than its factorization.

40366665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649 (or 2646 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 40366665 is about 6353.4766073387. The cubic root of 40366665 is about 343.0369930663.

It can be divided in two parts, 4036 and 6665, that added together give a palindrome (10701).

The spelling of 40366665 in words is "forty million, three hundred sixty-six thousand, six hundred sixty-five".