421923 has 8 divisors (see below), whose sum is σ = 595728. Its totient is φ = 264704.

The previous prime is 421913. The next prime is 421943. The reversal of 421923 is 329124.

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 421923 - 2⁴ = 421907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421923.

It is not an unprimeable number, because it can be changed into a prime (421913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4086 + ... + 4187.

It is an arithmetic number, because the mean of its divisors is an integer number (74466).

2⁴²¹⁹²³ is an apocalyptic number.

421923 is a deficient number, since it is larger than the sum of its proper divisors (173805).

421923 is a wasteful number, since it uses less digits than its factorization.

421923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8293.

The product of its digits is 432, while the sum is 21.

The square root of 421923 is about 649.5560022046. The cubic root of 421923 is about 75.0028443366.

It can be divided in two parts, 42192 and 3, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 421923 in words is "four hundred twenty-one thousand, nine hundred twenty-three".