421423405 has 32 divisors (see below), whose sum is σ = 559288800. Its totient is φ = 302914560.

The previous prime is 421423403. The next prime is 421423423. The reversal of 421423405 is 504324124.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 250493929 + 170929476 = 15827^2 + 13074^2 .

It is not a de Polignac number, because 421423405 - 2¹ = 421423403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421423405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421423403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 512895 + ... + 513715.

It is an arithmetic number, because the mean of its divisors is an integer number (17477775).

Almost surely, 2^421423405 is an apocalyptic number.

It is an amenable number.

421423405 is a deficient number, since it is larger than the sum of its proper divisors (137865395).

421423405 is a wasteful number, since it uses less digits than its factorization.

421423405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 421423405 is about 20528.5996843428. The cubic root of 421423405 is about 749.7322926032.

Adding to 421423405 its reverse (504324124), we get a palindrome (925747529).

The spelling of 421423405 in words is "four hundred twenty-one million, four hundred twenty-three thousand, four hundred five".