40308643 has 4 divisors (see below), whose sum is σ = 40379080. Its totient is φ = 40238208.

The previous prime is 40308613. The next prime is 40308659. The reversal of 40308643 is 34680304.

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 40308643 - 2⁹ = 40308131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40308613) 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, 34353 + ... + 35506.

It is an arithmetic number, because the mean of its divisors is an integer number (10094770).

Almost surely, 2^40308643 is an apocalyptic number.

40308643 is a deficient number, since it is larger than the sum of its proper divisors (70437).

40308643 is an equidigital number, since it uses as much as digits as its factorization.

40308643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70436.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40308643 is about 6348.9088038812. The cubic root of 40308643 is about 342.8725567558.

Adding to 40308643 its reverse (34680304), we get a palindrome (74988947).

The spelling of 40308643 in words is "forty million, three hundred eight thousand, six hundred forty-three".