420440473 has 2 divisors, whose sum is σ = 420440474. Its totient is φ = 420440472.

The previous prime is 420440441. The next prime is 420440497. The reversal of 420440473 is 374044024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281836944 + 138603529 = 16788^2 + 11773^2 .

It is a cyclic number.

It is not a de Polignac number, because 420440473 - 2⁵ = 420440441 is a prime.

It is equal to p_22366621 and since 420440473 and 22366621 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (420444473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210220236 + 210220237.

It is an arithmetic number, because the mean of its divisors is an integer number (210220237).

Almost surely, 2^420440473 is an apocalyptic number.

It is an amenable number.

420440473 is a deficient number, since it is larger than the sum of its proper divisors (1).

420440473 is an equidigital number, since it uses as much as digits as its factorization.

420440473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 28.

The square root of 420440473 is about 20504.6451566468. The cubic root of 420440473 is about 749.1489445641.

Adding to 420440473 its reverse (374044024), we get a palindrome (794484497).

The spelling of 420440473 in words is "four hundred twenty million, four hundred forty thousand, four hundred seventy-three".