623919 has 4 divisors (see below), whose sum is σ = 831896. Its totient is φ = 415944.

The previous prime is 623893. The next prime is 623923. The reversal of 623919 is 919326.

623919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 623919 - 2¹¹ = 621871 is a prime.

It is a super-2 number, since 2×623919² = 778549837122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623929) 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, 103984 + ... + 103989.

It is an arithmetic number, because the mean of its divisors is an integer number (207974).

2⁶²³⁹¹⁹ is an apocalyptic number.

623919 is a deficient number, since it is larger than the sum of its proper divisors (207977).

623919 is a wasteful number, since it uses less digits than its factorization.

623919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207976.

The product of its digits is 2916, while the sum is 30.

The square root of 623919 is about 789.8854347309. The cubic root of 623919 is about 85.4494759809.

The spelling of 623919 in words is "six hundred twenty-three thousand, nine hundred nineteen".