865402 has 8 divisors (see below), whose sum is σ = 1374516. Its totient is φ = 407232.

The previous prime is 865379. The next prime is 865409. The reversal of 865402 is 204568.

It can be written as a sum of positive squares in 2 ways, for example, as 848241 + 17161 = 921^2 + 131^2 .

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

It is not an unprimeable number, because it can be changed into a prime (865409) by changing a digit.

865402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 12693 + ... + 12760.

2⁸⁶⁵⁴⁰² is an apocalyptic number.

865402 is a deficient number, since it is larger than the sum of its proper divisors (509114).

865402 is a wasteful number, since it uses less digits than its factorization.

865402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25472.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 865402 is about 930.2698533221. The cubic root of 865402 is about 95.2955523213.

The spelling of 865402 in words is "eight hundred sixty-five thousand, four hundred two".