420444305 has 8 divisors (see below), whose sum is σ = 506396544. Its totient is φ = 335113200.

The previous prime is 420444287. The next prime is 420444307. The reversal of 420444305 is 503444024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420444305 - 2¹⁶ = 420378769 is a prime.

It is a super-3 number, since 3×420444305³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420444307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153791 + ... + 156500.

It is an arithmetic number, because the mean of its divisors is an integer number (63299568).

Almost surely, 2^420444305 is an apocalyptic number.

It is an amenable number.

420444305 is a deficient number, since it is larger than the sum of its proper divisors (85952239).

420444305 is a wasteful number, since it uses less digits than its factorization.

420444305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310567.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 420444305 is about 20504.7385986752. The cubic root of 420444305 is about 749.1512205343.

Adding to 420444305 its reverse (503444024), we get a palindrome (923888329).

The spelling of 420444305 in words is "four hundred twenty million, four hundred forty-four thousand, three hundred five".