40679721 has 12 divisors (see below), whose sum is σ = 60786180. Its totient is φ = 26184480.

The previous prime is 40679713. The next prime is 40679773. The reversal of 40679721 is 12797604.

It is a happy number.

40679721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33177600 + 7502121 = 5760^2 + 2739^2 .

It is not a de Polignac number, because 40679721 - 2³ = 40679713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40679701) 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 11 ways as a sum of consecutive naturals, for example, 77670 + ... + 78191.

It is an arithmetic number, because the mean of its divisors is an integer number (5065515).

Almost surely, 2^40679721 is an apocalyptic number.

It is an amenable number.

40679721 is a deficient number, since it is larger than the sum of its proper divisors (20106459).

40679721 is a wasteful number, since it uses less digits than its factorization.

40679721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155896 (or 155893 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 40679721 is about 6378.0656158431. The cubic root of 40679721 is about 343.9214965310.

The spelling of 40679721 in words is "forty million, six hundred seventy-nine thousand, seven hundred twenty-one".