402823 has 2 divisors, whose sum is σ = 402824. Its totient is φ = 402822.

The previous prime is 402817. The next prime is 402847. The reversal of 402823 is 328204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402823 - 2¹³ = 394631 is a prime.

402823 is a lucky number.

It is equal to p₃₄₀₆₆ and since 402823 and 34066 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201411 + 201412.

It is an arithmetic number, because the mean of its divisors is an integer number (201412).

2⁴⁰²⁸²³ is an apocalyptic number.

402823 is a deficient number, since it is larger than the sum of its proper divisors (1).

402823 is an equidigital number, since it uses as much as digits as its factorization.

402823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 402823 is about 634.6833856341. The cubic root of 402823 is about 73.8535574786.

It can be divided in two parts, 402 and 823, that added together give a triangular number (1225 = T₄₉).

The spelling of 402823 in words is "four hundred two thousand, eight hundred twenty-three".