402811 has 4 divisors (see below), whose sum is σ = 404800. Its totient is φ = 400824.

The previous prime is 402803. The next prime is 402817. The reversal of 402811 is 118204.

It is a happy number.

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 402811 - 2³ = 402803 is a prime.

It is a Duffinian number.

402811 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (402817) by changing a digit.

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, 651 + ... + 1108.

It is an arithmetic number, because the mean of its divisors is an integer number (101200).

2⁴⁰²⁸¹¹ is an apocalyptic number.

402811 is a deficient number, since it is larger than the sum of its proper divisors (1989).

402811 is a wasteful number, since it uses less digits than its factorization.

402811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 402811 is about 634.6739320312. The cubic root of 402811 is about 73.8528241115.

The spelling of 402811 in words is "four hundred two thousand, eight hundred eleven".