40665726 has 40 divisors (see below), whose sum is σ = 91711224. Its totient is φ = 13467600.

The previous prime is 40665721. The next prime is 40665749. The reversal of 40665726 is 62756604.

40665726 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40665726² = 3307402542214152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40665721) 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 19 ways as a sum of consecutive naturals, for example, 27301 + ... + 28751.

Almost surely, 2^40665726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40665726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45855612).

40665726 is an abundant number, since it is smaller than the sum of its proper divisors (51045498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40665726 is a wasteful number, since it uses less digits than its factorization.

40665726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638 (or 1629 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 40665726 is about 6376.9684019917. The cubic root of 40665726 is about 343.8820523617.

The spelling of 40665726 in words is "forty million, six hundred sixty-five thousand, seven hundred twenty-six".