40221824 has 16 divisors (see below), whose sum is σ = 80129670. Its totient is φ = 20110848.

The previous prime is 40221821. The next prime is 40221829. The reversal of 40221824 is 42812204.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 4700224 = 5960^2 + 2168^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 40221824.

It is not an unprimeable number, because it can be changed into a prime (40221821) 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 as a sum of consecutive naturals, namely, 156989 + ... + 157244.

Almost surely, 2^40221824 is an apocalyptic number.

It is an amenable number.

40221824 is a deficient number, since it is larger than the sum of its proper divisors (39907846).

40221824 is an equidigital number, since it uses as much as digits as its factorization.

40221824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314247 (or 314235 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 40221824 is about 6342.0678015928. The cubic root of 40221824 is about 342.6262138064.

The spelling of 40221824 in words is "forty million, two hundred twenty-one thousand, eight hundred twenty-four".