623990 has 16 divisors (see below), whose sum is σ = 1172448. Its totient is φ = 238656.

The previous prime is 623989. The next prime is 624007. The reversal of 623990 is 99326.

623990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127 + ... + 1586.

It is an arithmetic number, because the mean of its divisors is an integer number (73278).

2⁶²³⁹⁹⁰ is an apocalyptic number.

623990 is a deficient number, since it is larger than the sum of its proper divisors (548458).

623990 is a wasteful number, since it uses less digits than its factorization.

623990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 623990 is about 789.9303766789. The cubic root of 623990 is about 85.4527171509.

The spelling of 623990 in words is "six hundred twenty-three thousand, nine hundred ninety".