406445023 has 2 divisors, whose sum is σ = 406445024. Its totient is φ = 406445022.

The previous prime is 406445021. The next prime is 406445033. The reversal of 406445023 is 320544604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406445023 - 2¹ = 406445021 is a prime.

Together with 406445021, it forms a pair of twin primes.

It is equal to p_21661642 and since 406445023 and 21661642 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 406444982 and 406445000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406445021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203222511 + 203222512.

It is an arithmetic number, because the mean of its divisors is an integer number (203222512).

Almost surely, 2^406445023 is an apocalyptic number.

406445023 is a deficient number, since it is larger than the sum of its proper divisors (1).

406445023 is an equidigital number, since it uses as much as digits as its factorization.

406445023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 406445023 is about 20160.4817154750. The cubic root of 406445023 is about 740.7425119621.

Adding to 406445023 its reverse (320544604), we get a palindrome (726989627).

The spelling of 406445023 in words is "four hundred six million, four hundred forty-five thousand, twenty-three".