865426 has 4 divisors (see below), whose sum is σ = 1298142. Its totient is φ = 432712.

The previous prime is 865409. The next prime is 865457. The reversal of 865426 is 624568.

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

It can be written as a sum of positive squares in only one way, i.e., 855625 + 9801 = 925^2 + 99^2 .

It is a super-2 number, since 2×865426² = 1497924322952, which contains 22 as substring.

It is a plaindrome in base 12.

It is an unprimeable number.

865426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216355 + ... + 216358.

2⁸⁶⁵⁴²⁶ is an apocalyptic number.

865426 is a deficient number, since it is larger than the sum of its proper divisors (432716).

865426 is a wasteful number, since it uses less digits than its factorization.

865426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432715.

The product of its digits is 11520, while the sum is 31.

The square root of 865426 is about 930.2827527155. The cubic root of 865426 is about 95.2964332499.

The spelling of 865426 in words is "eight hundred sixty-five thousand, four hundred twenty-six".