421945923 has 16 divisors (see below), whose sum is σ = 643520000. Its totient is φ = 240903936.

The previous prime is 421945921. The next prime is 421945961. The reversal of 421945923 is 329549124.

It is not a de Polignac number, because 421945923 - 2¹ = 421945921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421945921) 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, 18186 + ... + 34272.

It is an arithmetic number, because the mean of its divisors is an integer number (40220000).

Almost surely, 2^421945923 is an apocalyptic number.

421945923 is a deficient number, since it is larger than the sum of its proper divisors (221574077).

421945923 is a wasteful number, since it uses less digits than its factorization.

421945923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17346.

The product of its digits is 77760, while the sum is 39.

The square root of 421945923 is about 20541.3223284189. The cubic root of 421945923 is about 750.0420260895.

The spelling of 421945923 in words is "four hundred twenty-one million, nine hundred forty-five thousand, nine hundred twenty-three".