861903 has 12 divisors (see below), whose sum is σ = 1422928. Its totient is φ = 492480.

The previous prime is 861901. The next prime is 861907. The reversal of 861903 is 309168.

It is not a de Polignac number, because 861903 - 2¹ = 861901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6778 + ... + 6903.

2⁸⁶¹⁹⁰³ is an apocalyptic number.

861903 is a deficient number, since it is larger than the sum of its proper divisors (561025).

861903 is a wasteful number, since it uses less digits than its factorization.

861903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13694 (or 13691 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 861903 is about 928.3873114170. The cubic root of 861903 is about 95.1669456015.

It can be divided in two parts, 861 and 903, that added together give a square (1764 = 42²).

The spelling of 861903 in words is "eight hundred sixty-one thousand, nine hundred three".