40721164 has 24 divisors (see below), whose sum is σ = 79844688. Its totient is φ = 18008640.

The previous prime is 40721089. The next prime is 40721167. The reversal of 40721164 is 46112704.

40721164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (40721167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10879 + ... + 14134.

It is an arithmetic number, because the mean of its divisors is an integer number (3326862).

Almost surely, 2^40721164 is an apocalyptic number.

40721164 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

40721164 is a deficient number, since it is larger than the sum of its proper divisors (39123524).

40721164 is a wasteful number, since it uses less digits than its factorization.

40721164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25065 (or 25063 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 40721164 is about 6381.3136578607. The cubic root of 40721164 is about 344.0382484062.

Adding to 40721164 its reverse (46112704), we get a palindrome (86833868).

The spelling of 40721164 in words is "forty million, seven hundred twenty-one thousand, one hundred sixty-four".