405480421 has 4 divisors (see below), whose sum is σ = 414107712. Its totient is φ = 396853132.

The previous prime is 405480401. The next prime is 405480431. The reversal of 405480421 is 124084504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405480421 - 2⁵ = 405480389 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 405480421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405480401) 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, 4313575 + ... + 4313668.

It is an arithmetic number, because the mean of its divisors is an integer number (103526928).

Almost surely, 2^405480421 is an apocalyptic number.

It is an amenable number.

405480421 is a deficient number, since it is larger than the sum of its proper divisors (8627291).

405480421 is an equidigital number, since it uses as much as digits as its factorization.

405480421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8627290.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 405480421 is about 20136.5444155645. The cubic root of 405480421 is about 740.1560548650.

The spelling of 405480421 in words is "four hundred five million, four hundred eighty thousand, four hundred twenty-one".