861423 has 4 divisors (see below), whose sum is σ = 1148568. Its totient is φ = 574280.

The previous prime is 861391. The next prime is 861433. The reversal of 861423 is 324168.

It is a happy number.

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 861423 - 2⁵ = 861391 is a prime.

It is a D-number.

861423 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 861393 and 861402.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143568 + ... + 143573.

It is an arithmetic number, because the mean of its divisors is an integer number (287142).

2⁸⁶¹⁴²³ is an apocalyptic number.

861423 is a deficient number, since it is larger than the sum of its proper divisors (287145).

861423 is a wasteful number, since it uses less digits than its factorization.

861423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287144.

The product of its digits is 1152, while the sum is 24.

The square root of 861423 is about 928.1287626186. The cubic root of 861423 is about 95.1492759347.

The spelling of 861423 in words is "eight hundred sixty-one thousand, four hundred twenty-three".