623855 has 4 divisors (see below), whose sum is σ = 748632. Its totient is φ = 499080.

The previous prime is 623851. The next prime is 623867. The reversal of 623855 is 558326.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 623855 - 2² = 623851 is a prime.

It is a super-2 number, since 2×623855² = 778390122050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62381 + ... + 62390.

It is an arithmetic number, because the mean of its divisors is an integer number (187158).

2⁶²³⁸⁵⁵ is an apocalyptic number.

623855 is a deficient number, since it is larger than the sum of its proper divisors (124777).

623855 is a wasteful number, since it uses less digits than its factorization.

623855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124776.

The product of its digits is 7200, while the sum is 29.

The square root of 623855 is about 789.8449214878. The cubic root of 623855 is about 85.4465541521.

The spelling of 623855 in words is "six hundred twenty-three thousand, eight hundred fifty-five".