40666626 has 192 divisors, whose sum is σ = 123492096. Its totient is φ = 9331200.

The previous prime is 40666607. The next prime is 40666627. The reversal of 40666626 is 62666604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40666627) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 666636 + ... + 666696.

It is an arithmetic number, because the mean of its divisors is an integer number (643188).

Almost surely, 2^40666626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40666626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61746048).

40666626 is an abundant number, since it is smaller than the sum of its proper divisors (82825470).

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

40666626 is a wasteful number, since it uses less digits than its factorization.

40666626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 40666626 is about 6377.0389680478. The cubic root of 40666626 is about 343.8845892365.

It can be divided in two parts, 40 and 666626, that added together give a palindrome (666666).

The spelling of 40666626 in words is "forty million, six hundred sixty-six thousand, six hundred twenty-six".