40643746 has 16 divisors (see below), whose sum is σ = 71624448. Its totient is φ = 17053200.

The previous prime is 40643711. The next prime is 40643747. The reversal of 40643746 is 64734604.

It is not an unprimeable number, because it can be changed into a prime (40643747) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 70770 + ... + 71341.

It is an arithmetic number, because the mean of its divisors is an integer number (4476528).

Almost surely, 2^40643746 is an apocalyptic number.

40643746 is a deficient number, since it is larger than the sum of its proper divisors (30980702).

40643746 is a wasteful number, since it uses less digits than its factorization.

40643746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142137.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 40643746 is about 6375.2447796143. The cubic root of 40643746 is about 343.8200846191.

The spelling of 40643746 in words is "forty million, six hundred forty-three thousand, seven hundred forty-six".