40056421 has 2 divisors, whose sum is σ = 40056422. Its totient is φ = 40056420.

The previous prime is 40056383. The next prime is 40056431. The reversal of 40056421 is 12465004.

40056421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 15444900 = 4961^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 40056421 - 2⁹ = 40055909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40056392 and 40056401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40056431) 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, 20028210 + 20028211.

It is an arithmetic number, because the mean of its divisors is an integer number (20028211).

Almost surely, 2^40056421 is an apocalyptic number.

It is an amenable number.

40056421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40056421 is an equidigital number, since it uses as much as digits as its factorization.

40056421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40056421 is about 6329.0142202400. The cubic root of 40056421 is about 342.1559113797.

The spelling of 40056421 in words is "forty million, fifty-six thousand, four hundred twenty-one".