40645243 has 4 divisors (see below), whose sum is σ = 40658008. Its totient is φ = 40632480.

The previous prime is 40645229. The next prime is 40645261. The reversal of 40645243 is 34254604.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40645243 - 2¹⁷ = 40514171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40645273) 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, 2755 + ... + 9427.

It is an arithmetic number, because the mean of its divisors is an integer number (10164502).

Almost surely, 2^40645243 is an apocalyptic number.

40645243 is a deficient number, since it is larger than the sum of its proper divisors (12765).

40645243 is an equidigital number, since it uses as much as digits as its factorization.

40645243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12764.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 40645243 is about 6375.3621857899. The cubic root of 40645243 is about 343.8243057880.

Adding to 40645243 its reverse (34254604), we get a palindrome (74899847).

The spelling of 40645243 in words is "forty million, six hundred forty-five thousand, two hundred forty-three".