402805 has 8 divisors (see below), whose sum is σ = 520632. Its totient is φ = 297408.

The previous prime is 402803. The next prime is 402817. The reversal of 402805 is 508204.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2116 + 400689 = 46^2 + 633^2 .

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 402805 - 2¹ = 402803 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3034 + ... + 3163.

It is an arithmetic number, because the mean of its divisors is an integer number (65079).

2⁴⁰²⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

402805 is a deficient number, since it is larger than the sum of its proper divisors (117827).

402805 is a wasteful number, since it uses less digits than its factorization.

402805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6215.

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

The square root of 402805 is about 634.6692051770. The cubic root of 402805 is about 73.8524574224.

It can be divided in two parts, 402 and 805, that multiplied together give a triangular number (323610 = T₈₀₄).

The spelling of 402805 in words is "four hundred two thousand, eight hundred five".