421693623 has 24 divisors (see below), whose sum is σ = 660339680. Its totient is φ = 257774400.

The previous prime is 421693621. The next prime is 421693631. The reversal of 421693623 is 326396124.

421693623 is a `hidden beast` number, since 4 + 21 + 6 + 9 + 3 + 623 = 666.

It is not a de Polignac number, because 421693623 - 2¹ = 421693621 is a prime.

It is a super-2 number, since 2×421693623² = 355651023357732258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421693621) 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 23 ways as a sum of consecutive naturals, for example, 5733 + ... + 29601.

Almost surely, 2^421693623 is an apocalyptic number.

421693623 is a deficient number, since it is larger than the sum of its proper divisors (238646057).

421693623 is a wasteful number, since it uses less digits than its factorization.

421693623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24039 (or 24036 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 421693623 is about 20535.1801306928. The cubic root of 421693623 is about 749.8925019263.

The spelling of 421693623 in words is "four hundred twenty-one million, six hundred ninety-three thousand, six hundred twenty-three".