40018786 has 4 divisors (see below), whose sum is σ = 60028182. Its totient is φ = 20009392.

The previous prime is 40018757. The next prime is 40018859. The reversal of 40018786 is 68781004.

It is a happy number.

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., 20930625 + 19088161 = 4575^2 + 4369^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004695 + ... + 10004698.

Almost surely, 2^40018786 is an apocalyptic number.

40018786 is a deficient number, since it is larger than the sum of its proper divisors (20009396).

40018786 is a wasteful number, since it uses less digits than its factorization.

40018786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20009395.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 40018786 is about 6326.0403097040. The cubic root of 40018786 is about 342.0487203028.

It can be divided in two parts, 40018 and 786, that added together give a palindrome (40804).

The spelling of 40018786 in words is "forty million, eighteen thousand, seven hundred eighty-six".