623939 has 4 divisors (see below), whose sum is σ = 625656. Its totient is φ = 622224.

The previous prime is 623933. The next prime is 623947. The reversal of 623939 is 939326.

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 623939 - 2⁴ = 623923 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (623933) 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, 74 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (156414).

2⁶²³⁹³⁹ is an apocalyptic number.

623939 is a deficient number, since it is larger than the sum of its proper divisors (1717).

623939 is a wasteful number, since it uses less digits than its factorization.

623939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its digits is 8748, while the sum is 32.

The square root of 623939 is about 789.8980946932. The cubic root of 623939 is about 85.4503890114.

The spelling of 623939 in words is "six hundred twenty-three thousand, nine hundred thirty-nine".