421406405 has 32 divisors (see below), whose sum is σ = 611186688. Its totient is φ = 272793600.

The previous prime is 421406389. The next prime is 421406413. The reversal of 421406405 is 504604124.

It is not a de Polignac number, because 421406405 - 2⁴ = 421406389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39749 + ... + 49221.

It is an arithmetic number, because the mean of its divisors is an integer number (19099584).

Almost surely, 2^421406405 is an apocalyptic number.

It is an amenable number.

421406405 is a deficient number, since it is larger than the sum of its proper divisors (189780283).

421406405 is a wasteful number, since it uses less digits than its factorization.

421406405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9557.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 421406405 is about 20528.1856236736. The cubic root of 421406405 is about 749.7222111980.

The spelling of 421406405 in words is "four hundred twenty-one million, four hundred six thousand, four hundred five".