623998 has 8 divisors (see below), whose sum is σ = 985320. Its totient is φ = 295560.

The previous prime is 623989. The next prime is 624007. The reversal of 623998 is 899326.

It is an interprime number because it is at equal distance from previous prime (623989) and next prime (624007).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 8173 + ... + 8248.

It is an arithmetic number, because the mean of its divisors is an integer number (123165).

2⁶²³⁹⁹⁸ is an apocalyptic number.

623998 is a deficient number, since it is larger than the sum of its proper divisors (361322).

623998 is a wasteful number, since it uses less digits than its factorization.

623998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16442.

The product of its digits is 23328, while the sum is 37.

The square root of 623998 is about 789.9354404000. The cubic root of 623998 is about 85.4530823377.

The spelling of 623998 in words is "six hundred twenty-three thousand, nine hundred ninety-eight".