420443633 has 8 divisors (see below), whose sum is σ = 423322536. Its totient is φ = 417571200.

The previous prime is 420443627. The next prime is 420443651. The reversal of 420443633 is 336344024.

It can be written as a sum of positive squares in 4 ways, for example, as 56130064 + 364313569 = 7492^2 + 19087^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 420443633 - 2⁸ = 420443377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420443596 and 420443605.

It is not an unprimeable number, because it can be changed into a prime (420443603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258563 + ... + 260183.

It is an arithmetic number, because the mean of its divisors is an integer number (52915317).

Almost surely, 2^420443633 is an apocalyptic number.

It is an amenable number.

420443633 is a deficient number, since it is larger than the sum of its proper divisors (2878903).

420443633 is a wasteful number, since it uses less digits than its factorization.

420443633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235.

The product of its (nonzero) digits is 20736, while the sum is 29.

The square root of 420443633 is about 20504.7222122125. The cubic root of 420443633 is about 749.1508214090.

Adding to 420443633 its reverse (336344024), we get a palindrome (756787657).

The spelling of 420443633 in words is "four hundred twenty million, four hundred forty-three thousand, six hundred thirty-three".