40639566 has 16 divisors (see below), whose sum is σ = 88668288. Its totient is φ = 12315000.

The previous prime is 40639561. The next prime is 40639609. The reversal of 40639566 is 66593604.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40639561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307810 + ... + 307941.

It is an arithmetic number, because the mean of its divisors is an integer number (5541768).

Almost surely, 2^40639566 is an apocalyptic number.

40639566 is an abundant number, since it is smaller than the sum of its proper divisors (48028722).

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

40639566 is a wasteful number, since it uses less digits than its factorization.

40639566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615767.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 40639566 is about 6374.9169406354. The cubic root of 40639566 is about 343.8082975065.

The spelling of 40639566 in words is "forty million, six hundred thirty-nine thousand, five hundred sixty-six".