40221644 has 12 divisors (see below), whose sum is σ = 70434168. Its totient is φ = 20097600.

The previous prime is 40221607. The next prime is 40221659. The reversal of 40221644 is 44612204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7364 + ... + 11604.

It is an arithmetic number, because the mean of its divisors is an integer number (5869514).

Almost surely, 2^40221644 is an apocalyptic number.

It is an amenable number.

40221644 is a deficient number, since it is larger than the sum of its proper divisors (30212524).

40221644 is a wasteful number, since it uses less digits than its factorization.

40221644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6616 (or 6614 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 40221644 is about 6342.0536106217. The cubic root of 40221644 is about 342.6257027007.

Adding to 40221644 its reverse (44612204), we get a palindrome (84833848).

The spelling of 40221644 in words is "forty million, two hundred twenty-one thousand, six hundred forty-four".