40545643 has 4 divisors (see below), whose sum is σ = 40904568. Its totient is φ = 40186720.

The previous prime is 40545623. The next prime is 40545647. The reversal of 40545643 is 34654504.

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

It is a cyclic number.

It is not a de Polignac number, because 40545643 - 2⁵ = 40545611 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40545647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179293 + ... + 179518.

It is an arithmetic number, because the mean of its divisors is an integer number (10226142).

Almost surely, 2^40545643 is an apocalyptic number.

40545643 is a deficient number, since it is larger than the sum of its proper divisors (358925).

40545643 is a wasteful number, since it uses less digits than its factorization.

40545643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358924.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 40545643 is about 6367.5460736456. The cubic root of 40545643 is about 343.5432322148.

The spelling of 40545643 in words is "forty million, five hundred forty-five thousand, six hundred forty-three".