40153721 has 2 divisors, whose sum is σ = 40153722. Its totient is φ = 40153720.

The previous prime is 40153697. The next prime is 40153781. The reversal of 40153721 is 12735104.

40153721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 19678096 = 4525^2 + 4436^2 .

It is a cyclic number.

It is not a de Polignac number, because 40153721 - 2¹⁴ = 40137337 is a prime.

It is a super-2 number, since 2×40153721² = 3224642620291682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40153781) 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 as a sum of consecutive naturals, namely, 20076860 + 20076861.

It is an arithmetic number, because the mean of its divisors is an integer number (20076861).

Almost surely, 2^40153721 is an apocalyptic number.

It is an amenable number.

40153721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40153721 is an equidigital number, since it uses as much as digits as its factorization.

40153721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 40153721 is about 6336.6963790291. The cubic root of 40153721 is about 342.4327280099.

Adding to 40153721 its reverse (12735104), we get a palindrome (52888825).

The spelling of 40153721 in words is "forty million, one hundred fifty-three thousand, seven hundred twenty-one".