420440073 has 32 divisors (see below), whose sum is σ = 619011072. Its totient is φ = 252672000.

The previous prime is 420440047. The next prime is 420440089. The reversal of 420440073 is 370044024.

It is not a de Polignac number, because 420440073 - 2⁹ = 420439561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420440003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158365 + ... + 160997.

It is an arithmetic number, because the mean of its divisors is an integer number (19344096).

Almost surely, 2^420440073 is an apocalyptic number.

It is an amenable number.

420440073 is a deficient number, since it is larger than the sum of its proper divisors (198570999).

420440073 is a wasteful number, since it uses less digits than its factorization.

420440073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785.

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 420440073 is about 20504.6354027571. The cubic root of 420440073 is about 749.1487069881.

Adding to 420440073 its reverse (370044024), we get a palindrome (790484097).

The spelling of 420440073 in words is "four hundred twenty million, four hundred forty thousand, seventy-three".