623890 has 16 divisors (see below), whose sum is σ = 1137240. Its totient is φ = 246400.

The previous prime is 623881. The next prime is 623893. The reversal of 623890 is 98326.

It can be written as a sum of positive squares in 4 ways, for example, as 516961 + 106929 = 719^2 + 327^2 .

It is a d-powerful number, because it can be written as 6⁵ + 2¹⁹ + 8⁵ + 3¹⁰ + 9 + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540 + ... + 1240.

2⁶²³⁸⁹⁰ is an apocalyptic number.

623890 is a deficient number, since it is larger than the sum of its proper divisors (513350).

623890 is a wasteful number, since it uses less digits than its factorization.

623890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 623890 is about 789.8670774251. The cubic root of 623890 is about 85.4481520520.

It can be divided in two parts, 6238 and 90, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 623890 in words is "six hundred twenty-three thousand, eight hundred ninety".