628139 has 2 divisors, whose sum is σ = 628140. Its totient is φ = 628138.

The previous prime is 628127. The next prime is 628171. The reversal of 628139 is 931826.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628189) 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, 314069 + 314070.

It is an arithmetic number, because the mean of its divisors is an integer number (314070).

2⁶²⁸¹³⁹ is an apocalyptic number.

628139 is a deficient number, since it is larger than the sum of its proper divisors (1).

628139 is an equidigital number, since it uses as much as digits as its factorization.

628139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 628139 is about 792.5522064823. The cubic root of 628139 is about 85.6416947574.

It can be divided in two parts, 628 and 139, that added together give a palindrome (767).

The spelling of 628139 in words is "six hundred twenty-eight thousand, one hundred thirty-nine".