405478 has 8 divisors (see below), whose sum is σ = 629280. Its totient is φ = 195720.

The previous prime is 405473. The next prime is 405487. The reversal of 405478 is 874504.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405473) 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, 3438 + ... + 3553.

It is an arithmetic number, because the mean of its divisors is an integer number (78660).

2⁴⁰⁵⁴⁷⁸ is an apocalyptic number.

405478 is a deficient number, since it is larger than the sum of its proper divisors (223802).

405478 is a wasteful number, since it uses less digits than its factorization.

405478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7022.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 405478 is about 636.7715445904. The cubic root of 405478 is about 74.0154581780.

Subtracting from 405478 its sum of digits (28), we obtain a triangular number (405450 = T₉₀₀).

The spelling of 405478 in words is "four hundred five thousand, four hundred seventy-eight".