402806 has 4 divisors (see below), whose sum is σ = 604212. Its totient is φ = 201402.

The previous prime is 402803. The next prime is 402817. The reversal of 402806 is 608204.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402806.

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 as a sum of consecutive naturals, namely, 100700 + ... + 100703.

It is an arithmetic number, because the mean of its divisors is an integer number (151053).

2⁴⁰²⁸⁰⁶ is an apocalyptic number.

402806 is a deficient number, since it is larger than the sum of its proper divisors (201406).

402806 is a wasteful number, since it uses less digits than its factorization.

402806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201405.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 402806 is about 634.6699929885. The cubic root of 402806 is about 73.8525185375.

The spelling of 402806 in words is "four hundred two thousand, eight hundred six".