40043213 has 16 divisors (see below), whose sum is σ = 47241600. Its totient is φ = 33224256.

The previous prime is 40043209. The next prime is 40043233. The reversal of 40043213 is 31234004.

It is a cyclic number.

It is not a de Polignac number, because 40043213 - 2² = 40043209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40043191 and 40043200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40043233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90170 + ... + 90612.

It is an arithmetic number, because the mean of its divisors is an integer number (2952600).

Almost surely, 2^40043213 is an apocalyptic number.

It is an amenable number.

40043213 is a deficient number, since it is larger than the sum of its proper divisors (7198387).

40043213 is a wasteful number, since it uses less digits than its factorization.

40043213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 40043213 is about 6327.9706857728. The cubic root of 40043213 is about 342.1183003303.

Adding to 40043213 its reverse (31234004), we get a palindrome (71277217).

The spelling of 40043213 in words is "forty million, forty-three thousand, two hundred thirteen".