626399 has 4 divisors (see below), whose sum is σ = 663264. Its totient is φ = 589536.

The previous prime is 626393. The next prime is 626443. The reversal of 626399 is 993626.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993626 = 2 ⋅496813.

It is a cyclic number.

It is not a de Polignac number, because 626399 - 2¹⁶ = 560863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18407 + ... + 18440.

It is an arithmetic number, because the mean of its divisors is an integer number (165816).

2⁶²⁶³⁹⁹ is an apocalyptic number.

626399 is a deficient number, since it is larger than the sum of its proper divisors (36865).

626399 is a wasteful number, since it uses less digits than its factorization.

626399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36864.

The product of its digits is 17496, while the sum is 35.

The square root of 626399 is about 791.4537257478. The cubic root of 626399 is about 85.5625432971.

The spelling of 626399 in words is "six hundred twenty-six thousand, three hundred ninety-nine".