421187423 has 4 divisors (see below), whose sum is σ = 422165088. Its totient is φ = 420209760.

The previous prime is 421187419. The next prime is 421187453. The reversal of 421187423 is 324781124.

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 421187423 - 2² = 421187419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421187423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421187413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488186 + ... + 489047.

It is an arithmetic number, because the mean of its divisors is an integer number (105541272).

Almost surely, 2^421187423 is an apocalyptic number.

421187423 is a deficient number, since it is larger than the sum of its proper divisors (977665).

421187423 is an equidigital number, since it uses as much as digits as its factorization.

421187423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977664.

The product of its digits is 10752, while the sum is 32.

The square root of 421187423 is about 20522.8512395330. The cubic root of 421187423 is about 749.5923254050.

The spelling of 421187423 in words is "four hundred twenty-one million, one hundred eighty-seven thousand, four hundred twenty-three".