402506 has 16 divisors (see below), whose sum is σ = 660744. Its totient is φ = 182784.

The previous prime is 402503. The next prime is 402511. The reversal of 402506 is 605204.

402506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 167281 + 235225 = 409^2 + 485^2 .

It is a super-2 number, since 2×402506² = 324022160072, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402506.

It is not an unprimeable number, because it can be changed into a prime (402503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2870 + ... + 3006.

2⁴⁰²⁵⁰⁶ is an apocalyptic number.

402506 is a deficient number, since it is larger than the sum of its proper divisors (258238).

402506 is a wasteful number, since it uses less digits than its factorization.

402506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 402506 is about 634.4336056673. The cubic root of 402506 is about 73.8341794709.

The spelling of 402506 in words is "four hundred two thousand, five hundred six".