42823621 has 2 divisors, whose sum is σ = 42823622. Its totient is φ = 42823620.

The previous prime is 42823619. The next prime is 42823661. The reversal of 42823621 is 12632824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29052100 + 13771521 = 5390^2 + 3711^2 .

It is a cyclic number.

It is not a de Polignac number, because 42823621 - 2¹ = 42823619 is a prime.

Together with 42823619, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42823621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42823661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21411810 + 21411811.

It is an arithmetic number, because the mean of its divisors is an integer number (21411811).

Almost surely, 2^42823621 is an apocalyptic number.

It is an amenable number.

42823621 is a deficient number, since it is larger than the sum of its proper divisors (1).

42823621 is an equidigital number, since it uses as much as digits as its factorization.

42823621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 28.

The square root of 42823621 is about 6543.9759321073. The cubic root of 42823621 is about 349.8601373145.

The spelling of 42823621 in words is "forty-two million, eight hundred twenty-three thousand, six hundred twenty-one".