42320389 has 2 divisors, whose sum is σ = 42320390. Its totient is φ = 42320388.

The previous prime is 42320387. The next prime is 42320401. The reversal of 42320389 is 98302324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 15880225 = 5142^2 + 3985^2 .

It is a cyclic number.

It is not a de Polignac number, because 42320389 - 2¹ = 42320387 is a prime.

It is a super-2 number, since 2×42320389² = 3582030650222642, which contains 22 as substring.

Together with 42320387, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42320389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42320381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160194 + 21160195.

It is an arithmetic number, because the mean of its divisors is an integer number (21160195).

Almost surely, 2^42320389 is an apocalyptic number.

It is an amenable number.

42320389 is a deficient number, since it is larger than the sum of its proper divisors (1).

42320389 is an equidigital number, since it uses as much as digits as its factorization.

42320389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 42320389 is about 6505.4122851669. The cubic root of 42320389 is about 348.4843000502.

The spelling of 42320389 in words is "forty-two million, three hundred twenty thousand, three hundred eighty-nine".