40644743 has 8 divisors (see below), whose sum is σ = 42940800. Its totient is φ = 38364408.

The previous prime is 40644733. The next prime is 40644757. The reversal of 40644743 is 34744604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40644743 - 2¹² = 40640647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644713) 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, 1598 + ... + 9156.

It is an arithmetic number, because the mean of its divisors is an integer number (5367600).

Almost surely, 2^40644743 is an apocalyptic number.

40644743 is a deficient number, since it is larger than the sum of its proper divisors (2296057).

40644743 is a wasteful number, since it uses less digits than its factorization.

40644743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7861.

The product of its (nonzero) digits is 32256, while the sum is 32.

The square root of 40644743 is about 6375.3229722109. The cubic root of 40644743 is about 343.8228959235.

The spelling of 40644743 in words is "forty million, six hundred forty-four thousand, seven hundred forty-three".