306440023 has 2 divisors, whose sum is σ = 306440024. Its totient is φ = 306440022.

The previous prime is 306440021. The next prime is 306440039. The reversal of 306440023 is 320044603.

It is a weak prime.

It is an emirp because it is prime and its reverse (320044603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 306440023 - 2¹ = 306440021 is a prime.

Together with 306440021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 306439976 and 306440003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306440021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153220011 + 153220012.

It is an arithmetic number, because the mean of its divisors is an integer number (153220012).

Almost surely, 2^306440023 is an apocalyptic number.

306440023 is a deficient number, since it is larger than the sum of its proper divisors (1).

306440023 is an equidigital number, since it uses as much as digits as its factorization.

306440023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 306440023 is about 17505.4283866462. The cubic root of 306440023 is about 674.1892583420.

Adding to 306440023 its reverse (320044603), we get a palindrome (626484626).

The spelling of 306440023 in words is "three hundred six million, four hundred forty thousand, twenty-three".