402665 has 8 divisors (see below), whose sum is σ = 500040. Its totient is φ = 310912.

The previous prime is 402631. The next prime is 402691. The reversal of 402665 is 566204.

It can be written as a sum of positive squares in 4 ways, for example, as 8281 + 394384 = 91^2 + 628^2 .

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 402665 - 2⁶ = 402601 is a prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 402665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1244 + ... + 1533.

It is an arithmetic number, because the mean of its divisors is an integer number (62505).

2⁴⁰²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

402665 is a deficient number, since it is larger than the sum of its proper divisors (97375).

402665 is a wasteful number, since it uses less digits than its factorization.

402665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 402665 is about 634.5589019153. The cubic root of 402665 is about 73.8439003107.

Adding to 402665 its reverse (566204), we get a palindrome (968869).

The spelling of 402665 in words is "four hundred two thousand, six hundred sixty-five".