40289621 has 2 divisors, whose sum is σ = 40289622. Its totient is φ = 40289620.

The previous prime is 40289617. The next prime is 40289647. The reversal of 40289621 is 12698204.

40289621 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., 39627025 + 662596 = 6295^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 40289621 - 2² = 40289617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40280621) 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, 20144810 + 20144811.

It is an arithmetic number, because the mean of its divisors is an integer number (20144811).

Almost surely, 2^40289621 is an apocalyptic number.

It is an amenable number.

40289621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40289621 is an equidigital number, since it uses as much as digits as its factorization.

40289621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 40289621 is about 6347.4105743996. The cubic root of 40289621 is about 342.8186134200.

The spelling of 40289621 in words is "forty million, two hundred eighty-nine thousand, six hundred twenty-one".