626389 has 2 divisors, whose sum is σ = 626390. Its totient is φ = 626388.

The previous prime is 626377. The next prime is 626393. The reversal of 626389 is 983626.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592900 + 33489 = 770^2 + 183^2 .

It is a cyclic number.

It is not a de Polignac number, because 626389 - 2⁷ = 626261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626189) by changing a digit.

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 as a sum of consecutive naturals, namely, 313194 + 313195.

It is an arithmetic number, because the mean of its divisors is an integer number (313195).

2⁶²⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

626389 is a deficient number, since it is larger than the sum of its proper divisors (1).

626389 is an equidigital number, since it uses as much as digits as its factorization.

626389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 626389 is about 791.4474082338. The cubic root of 626389 is about 85.5620879803.

The spelling of 626389 in words is "six hundred twenty-six thousand, three hundred eighty-nine".