40980721 has 2 divisors, whose sum is σ = 40980722. Its totient is φ = 40980720.

The previous prime is 40980707. The next prime is 40980749. The reversal of 40980721 is 12708904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 518400 = 6361^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 40980721 - 2¹¹ = 40978673 is a prime.

It is not a weakly prime, because it can be changed into another prime (40980221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490360 + 20490361.

It is an arithmetic number, because the mean of its divisors is an integer number (20490361).

Almost surely, 2^40980721 is an apocalyptic number.

It is an amenable number.

40980721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40980721 is an equidigital number, since it uses as much as digits as its factorization.

40980721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 40980721 is about 6401.6186234420. The cubic root of 40980721 is about 344.7676682637.

The spelling of 40980721 in words is "forty million, nine hundred eighty thousand, seven hundred twenty-one".