623989 has 2 divisors, whose sum is σ = 623990. Its totient is φ = 623988.

The previous prime is 623983. The next prime is 624007. The reversal of 623989 is 989326.

623989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321489 + 302500 = 567^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 623989 - 2⁵ = 623957 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁶ + 2 + 9⁴ + 3¹² + 8⁵ + 9⁴ .

623989 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311994 + 311995.

It is an arithmetic number, because the mean of its divisors is an integer number (311995).

2⁶²³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

623989 is a deficient number, since it is larger than the sum of its proper divisors (1).

623989 is an equidigital number, since it uses as much as digits as its factorization.

623989 is an evil number, because the sum of its binary digits is even.

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

The square root of 623989 is about 789.9297437114. The cubic root of 623989 is about 85.4526715023.

It can be divided in two parts, 6239 and 89, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 623989 in words is "six hundred twenty-three thousand, nine hundred eighty-nine".