402505 has 8 divisors (see below), whose sum is σ = 489600. Its totient is φ = 317616.

The previous prime is 402503. The next prime is 402511. The reversal of 402505 is 505204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402505 - 2¹ = 402503 is a prime.

It is an Ulam number.

It is a plaindrome in base 13.

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, 115 + ... + 904.

It is an arithmetic number, because the mean of its divisors is an integer number (61200).

2⁴⁰²⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

402505 is a deficient number, since it is larger than the sum of its proper divisors (87095).

402505 is a wasteful number, since it uses less digits than its factorization.

402505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 402505 is about 634.4328175623. The cubic root of 402505 is about 73.8341183254.

Adding to 402505 its reverse (505204), we get a palindrome (907709).

The spelling of 402505 in words is "four hundred two thousand, five hundred five".