40013243 has 16 divisors (see below), whose sum is σ = 43092000. Its totient is φ = 37078272.

The previous prime is 40013227. The next prime is 40013249. The reversal of 40013243 is 34231004.

It is a cyclic number.

It is not a de Polignac number, because 40013243 - 2⁴ = 40013227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40013249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95288 + ... + 95706.

It is an arithmetic number, because the mean of its divisors is an integer number (2693250).

Almost surely, 2^40013243 is an apocalyptic number.

40013243 is a deficient number, since it is larger than the sum of its proper divisors (3078757).

40013243 is a wasteful number, since it uses less digits than its factorization.

40013243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574.

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

The square root of 40013243 is about 6325.6021847726. The cubic root of 40013243 is about 342.0329271901.

Adding to 40013243 its reverse (34231004), we get a palindrome (74244247).

The spelling of 40013243 in words is "forty million, thirteen thousand, two hundred forty-three".