405022621 has 2 divisors, whose sum is σ = 405022622. Its totient is φ = 405022620.

The previous prime is 405022591. The next prime is 405022649. The reversal of 405022621 is 126220504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322920900 + 82101721 = 17970^2 + 9061^2 .

It is a cyclic number.

It is not a de Polignac number, because 405022621 - 2⁵ = 405022589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405022592 and 405022601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405022021) 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, 202511310 + 202511311.

It is an arithmetic number, because the mean of its divisors is an integer number (202511311).

Almost surely, 2^405022621 is an apocalyptic number.

It is an amenable number.

405022621 is a deficient number, since it is larger than the sum of its proper divisors (1).

405022621 is an equidigital number, since it uses as much as digits as its factorization.

405022621 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 405022621 is about 20125.1738129140. The cubic root of 405022621 is about 739.8773969028.

The spelling of 405022621 in words is "four hundred five million, twenty-two thousand, six hundred twenty-one".