40006444 has 24 divisors (see below), whose sum is σ = 71160768. Its totient is φ = 19677840.

The previous prime is 40006433. The next prime is 40006471. The reversal of 40006444 is 44460004.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90087 + ... + 90529.

It is an arithmetic number, because the mean of its divisors is an integer number (2965032).

Almost surely, 2^40006444 is an apocalyptic number.

It is an amenable number.

40006444 is a deficient number, since it is larger than the sum of its proper divisors (31154324).

40006444 is a wasteful number, since it uses less digits than its factorization.

40006444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40006444 is about 6325.0647427517. The cubic root of 40006444 is about 342.0135534909.

Adding to 40006444 its reverse (44460004), we get a palindrome (84466448).

The spelling of 40006444 in words is "forty million, six thousand, four hundred forty-four".