421423156 has 72 divisors (see below), whose sum is σ = 933085440. Its totient is φ = 163014720.

The previous prime is 421423151. The next prime is 421423169. The reversal of 421423156 is 651324124.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421423151) 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, 585765 + ... + 586483.

It is an arithmetic number, because the mean of its divisors is an integer number (12959520).

Almost surely, 2^421423156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421423156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (466542720).

421423156 is an abundant number, since it is smaller than the sum of its proper divisors (511662284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421423156 is a wasteful number, since it uses less digits than its factorization.

421423156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 912 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 421423156 is about 20528.5936196321. The cubic root of 421423156 is about 749.7321449422.

The spelling of 421423156 in words is "four hundred twenty-one million, four hundred twenty-three thousand, one hundred fifty-six".