861403 has 4 divisors (see below), whose sum is σ = 906760. Its totient is φ = 816048.

The previous prime is 861391. The next prime is 861433. The reversal of 861403 is 304168.

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

It is a cyclic number.

It is not a de Polignac number, because 861403 - 2⁹ = 860891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861433) by changing a digit.

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, 22650 + ... + 22687.

It is an arithmetic number, because the mean of its divisors is an integer number (226690).

2⁸⁶¹⁴⁰³ is an apocalyptic number.

861403 is a deficient number, since it is larger than the sum of its proper divisors (45357).

861403 is a wasteful number, since it uses less digits than its factorization.

861403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45356.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 861403 is about 928.1179881890. The cubic root of 861403 is about 95.1485395561.

The spelling of 861403 in words is "eight hundred sixty-one thousand, four hundred three".