40066786 has 4 divisors (see below), whose sum is σ = 60100182. Its totient is φ = 20033392.

The previous prime is 40066783. The next prime is 40066811. The reversal of 40066786 is 68766004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 5433561 = 5885^2 + 2331^2 .

It is not an unprimeable number, because it can be changed into a prime (40066783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10016695 + ... + 10016698.

Almost surely, 2^40066786 is an apocalyptic number.

40066786 is a deficient number, since it is larger than the sum of its proper divisors (20033396).

40066786 is a wasteful number, since it uses less digits than its factorization.

40066786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20033395.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 40066786 is about 6329.8330151750. The cubic root of 40066786 is about 342.1854209238.

The spelling of 40066786 in words is "forty million, sixty-six thousand, seven hundred eighty-six".