623871 has 12 divisors (see below), whose sum is σ = 911248. Its totient is φ = 411264.

The previous prime is 623869. The next prime is 623879. The reversal of 623871 is 178326.

It is not a de Polignac number, because 623871 - 2¹ = 623869 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 (623879) 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, 591 + ... + 1263.

2⁶²³⁸⁷¹ is an apocalyptic number.

623871 is a deficient number, since it is larger than the sum of its proper divisors (287377).

623871 is a wasteful number, since it uses less digits than its factorization.

623871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 779 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 623871 is about 789.8550499934. The cubic root of 623871 is about 85.4472846280.

The spelling of 623871 in words is "six hundred twenty-three thousand, eight hundred seventy-one".