402623 has 4 divisors (see below), whose sum is σ = 433608. Its totient is φ = 371640.

The previous prime is 402613. The next prime is 402631. The reversal of 402623 is 326204.

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 402623 - 2⁶ = 402559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402613) 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, 15473 + ... + 15498.

It is an arithmetic number, because the mean of its divisors is an integer number (108402).

2⁴⁰²⁶²³ is an apocalyptic number.

402623 is a deficient number, since it is larger than the sum of its proper divisors (30985).

402623 is a wasteful number, since it uses less digits than its factorization.

402623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30984.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 402623 is about 634.5258071978. The cubic root of 402623 is about 73.8413327905.

Adding to 402623 its reverse (326204), we get a palindrome (728827).

It can be divided in two parts, 40262 and 3, that multiplied together give a triangular number (120786 = T₄₉₁).

The spelling of 402623 in words is "four hundred two thousand, six hundred twenty-three".