405479 has 4 divisors (see below), whose sum is σ = 426840. Its totient is φ = 384120.

The previous prime is 405473. The next prime is 405487. The reversal of 405479 is 974504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405479 - 2¹⁶ = 339943 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10652 + ... + 10689.

It is an arithmetic number, because the mean of its divisors is an integer number (106710).

2⁴⁰⁵⁴⁷⁹ is an apocalyptic number.

405479 is a deficient number, since it is larger than the sum of its proper divisors (21361).

405479 is a wasteful number, since it uses less digits than its factorization.

405479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21360.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 405479 is about 636.7723298008. The cubic root of 405479 is about 74.0155190242.

Subtracting from 405479 its sum of digits (29), we obtain a triangular number (405450 = T₉₀₀).

The spelling of 405479 in words is "four hundred five thousand, four hundred seventy-nine".