421264405 has 8 divisors (see below), whose sum is σ = 515055672. Its totient is φ = 330652608.

The previous prime is 421264397. The next prime is 421264423. The reversal of 421264405 is 504462124.

It can be written as a sum of positive squares in 4 ways, for example, as 185150449 + 236113956 = 13607^2 + 15366^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421264405 - 2³ = 421264397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794574 + ... + 795103.

It is an arithmetic number, because the mean of its divisors is an integer number (64381959).

Almost surely, 2^421264405 is an apocalyptic number.

It is an amenable number.

421264405 is a deficient number, since it is larger than the sum of its proper divisors (93791267).

421264405 is a wasteful number, since it uses less digits than its factorization.

421264405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589735.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 421264405 is about 20524.7266729669. The cubic root of 421264405 is about 749.6379912202.

The spelling of 421264405 in words is "four hundred twenty-one million, two hundred sixty-four thousand, four hundred five".