40423643 has 4 divisors (see below), whose sum is σ = 43533168. Its totient is φ = 37314120.

The previous prime is 40423639. The next prime is 40423661. The reversal of 40423643 is 34632404.

40423643 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 is a cyclic number.

It is not a de Polignac number, because 40423643 - 2² = 40423639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40423633) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1554743 + ... + 1554768.

It is an arithmetic number, because the mean of its divisors is an integer number (10883292).

Almost surely, 2^40423643 is an apocalyptic number.

40423643 is a deficient number, since it is larger than the sum of its proper divisors (3109525).

40423643 is a wasteful number, since it uses less digits than its factorization.

40423643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109524.

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 40423643 is about 6357.9590278642. The cubic root of 40423643 is about 343.1983173730.

The spelling of 40423643 in words is "forty million, four hundred twenty-three thousand, six hundred forty-three".