402406 has 4 divisors (see below), whose sum is σ = 603612. Its totient is φ = 201202.

The previous prime is 402403. The next prime is 402419. The reversal of 402406 is 604204.

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

It is a self number, because there is not a number n which added to its sum of digits gives 402406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100600 + ... + 100603.

It is an arithmetic number, because the mean of its divisors is an integer number (150903).

2⁴⁰²⁴⁰⁶ is an apocalyptic number.

402406 is a deficient number, since it is larger than the sum of its proper divisors (201206).

402406 is a wasteful number, since it uses less digits than its factorization.

402406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201205.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 402406 is about 634.3547903185. The cubic root of 402406 is about 73.8280644238.

It can be divided in two parts, 402 and 406, that added together give a palindrome (808).

The spelling of 402406 in words is "four hundred two thousand, four hundred six".