623971 has 6 divisors (see below), whose sum is σ = 637980. Its totient is φ = 610236.

The previous prime is 623963. The next prime is 623977. The reversal of 623971 is 179326.

It is not a de Polignac number, because 623971 - 2³ = 623963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4420 + ... + 4558.

It is an arithmetic number, because the mean of its divisors is an integer number (106330).

623971 is a Friedman number, since it can be written as 139*67^2, using all its digits and the basic arithmetic operations.

2⁶²³⁹⁷¹ is an apocalyptic number.

623971 is a deficient number, since it is larger than the sum of its proper divisors (14009).

623971 is an equidigital number, since it uses as much as digits as its factorization.

623971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 206 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 623971 is about 789.9183502110. The cubic root of 623971 is about 85.4518498196.

The spelling of 623971 in words is "six hundred twenty-three thousand, nine hundred seventy-one".