40006442 has 12 divisors (see below), whose sum is σ = 69807330. Its totient is φ = 17145576.

The previous prime is 40006433. The next prime is 40006471. The reversal of 40006442 is 24460004.

It can be written as a sum of positive squares in only one way, i.e., 33189121 + 6817321 = 5761^2 + 2611^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204017 + ... + 204212.

Almost surely, 2^40006442 is an apocalyptic number.

40006442 is a deficient number, since it is larger than the sum of its proper divisors (29800888).

40006442 is a wasteful number, since it uses less digits than its factorization.

40006442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408245 (or 408238 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 40006442 is about 6325.0645846505. The cubic root of 40006442 is about 342.0135477916.

Adding to 40006442 its reverse (24460004), we get a palindrome (64466446).

The spelling of 40006442 in words is "forty million, six thousand, four hundred forty-two".