420730673 has 6 divisors (see below), whose sum is σ = 462456162. Its totient is φ = 382482320.

The previous prime is 420730669. The next prime is 420730691. The reversal of 420730673 is 376037024.

It can be written as a sum of positive squares in only one way, i.e., 369293089 + 51437584 = 19217^2 + 7172^2 .

It is not a de Polignac number, because 420730673 - 2² = 420730669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420730633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1738436 + ... + 1738677.

It is an arithmetic number, because the mean of its divisors is an integer number (77076027).

Almost surely, 2^420730673 is an apocalyptic number.

It is an amenable number.

420730673 is a deficient number, since it is larger than the sum of its proper divisors (41725489).

420730673 is a wasteful number, since it uses less digits than its factorization.

420730673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477135 (or 3477124 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 32.

The square root of 420730673 is about 20511.7203812845. The cubic root of 420730673 is about 749.3212662422.

Adding to 420730673 its reverse (376037024), we get a palindrome (796767697).

The spelling of 420730673 in words is "four hundred twenty million, seven hundred thirty thousand, six hundred seventy-three".