420633623 has 4 divisors (see below), whose sum is σ = 420789168. Its totient is φ = 420478080.

The previous prime is 420633593. The next prime is 420633643. The reversal of 420633623 is 326336024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420633623 - 2⁶ = 420633559 is a prime.

It is a super-2 number, since 2×420633623² = 353865289596212258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420633643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73643 + ... + 79148.

It is an arithmetic number, because the mean of its divisors is an integer number (105197292).

Almost surely, 2^420633623 is an apocalyptic number.

420633623 is a deficient number, since it is larger than the sum of its proper divisors (155545).

420633623 is a wasteful number, since it uses less digits than its factorization.

420633623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155544.

The product of its (nonzero) digits is 15552, while the sum is 29.

The square root of 420633623 is about 20509.3545242165. The cubic root of 420633623 is about 749.2636464664.

Adding to 420633623 its reverse (326336024), we get a palindrome (746969647).

The spelling of 420633623 in words is "four hundred twenty million, six hundred thirty-three thousand, six hundred twenty-three".