802405 has 4 divisors (see below), whose sum is σ = 962892. Its totient is φ = 641920.

The previous prime is 802387. The next prime is 802421. The reversal of 802405 is 504208.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 159201 + 643204 = 399^2 + 802^2 .

It is not a de Polignac number, because 802405 - 2¹¹ = 800357 is a prime.

It is a Duffinian number.

802405 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80236 + ... + 80245.

It is an arithmetic number, because the mean of its divisors is an integer number (240723).

2⁸⁰²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

802405 is a deficient number, since it is larger than the sum of its proper divisors (160487).

802405 is a wasteful number, since it uses less digits than its factorization.

802405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160486.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 802405 is about 895.7706179598. The cubic root of 802405 is about 92.9247087849.

It can be divided in two parts, 80 and 2405, that added together give a triangular number (2485 = T₇₀).

The spelling of 802405 in words is "eight hundred two thousand, four hundred five".