40686418 has 4 divisors (see below), whose sum is σ = 61029630. Its totient is φ = 20343208.

The previous prime is 40686409. The next prime is 40686431. The reversal of 40686418 is 81468604.

40686418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 40615129 + 71289 = 6373^2 + 267^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10171603 + ... + 10171606.

Almost surely, 2^40686418 is an apocalyptic number.

40686418 is a deficient number, since it is larger than the sum of its proper divisors (20343212).

40686418 is a wasteful number, since it uses less digits than its factorization.

40686418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20343211.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 40686418 is about 6378.5905966757. The cubic root of 40686418 is about 343.9403684720.

The spelling of 40686418 in words is "forty million, six hundred eighty-six thousand, four hundred eighteen".