421645623 has 16 divisors (see below), whose sum is σ = 642925056. Its totient is φ = 240783840.

The previous prime is 421645619. The next prime is 421645633. The reversal of 421645623 is 326546124.

It is not a de Polignac number, because 421645623 - 2² = 421645619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421645633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31813 + ... + 43073.

It is an arithmetic number, because the mean of its divisors is an integer number (40182816).

Almost surely, 2^421645623 is an apocalyptic number.

421645623 is a deficient number, since it is larger than the sum of its proper divisors (221279433).

421645623 is a wasteful number, since it uses less digits than its factorization.

421645623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13054.

The product of its digits is 34560, while the sum is 33.

The square root of 421645623 is about 20534.0113713809. The cubic root of 421645623 is about 749.8640482465.

The spelling of 421645623 in words is "four hundred twenty-one million, six hundred forty-five thousand, six hundred twenty-three".