40213643 has 4 divisors (see below), whose sum is σ = 41148888. Its totient is φ = 39278400.

The previous prime is 40213639. The next prime is 40213651. The reversal of 40213643 is 34631204.

It is a happy number.

40213643 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 40213643 - 2² = 40213639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40213543) 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, 467558 + ... + 467643.

It is an arithmetic number, because the mean of its divisors is an integer number (10287222).

Almost surely, 2^40213643 is an apocalyptic number.

40213643 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

40213643 is a deficient number, since it is larger than the sum of its proper divisors (935245).

40213643 is an equidigital number, since it uses as much as digits as its factorization.

40213643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935244.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 40213643 is about 6341.4227898793. The cubic root of 40213643 is about 342.6029825119.

Adding to 40213643 its reverse (34631204), we get a palindrome (74844847).

The spelling of 40213643 in words is "forty million, two hundred thirteen thousand, six hundred forty-three".