6403988629 has 2 divisors, whose sum is σ = 6403988630. Its totient is φ = 6403988628.

The previous prime is 6403988623. The next prime is 6403988663. The reversal of 6403988629 is 9268893046.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5808726225 + 595262404 = 76215^2 + 24398^2 .

It is a cyclic number.

It is not a de Polignac number, because 6403988629 - 2⁷ = 6403988501 is a prime.

It is a super-2 number, since 2×6403988629² = 82022140720722599282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6403988629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6403988623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201994314 + 3201994315.

It is an arithmetic number, because the mean of its divisors is an integer number (3201994315).

Almost surely, 2^6403988629 is an apocalyptic number.

It is an amenable number.

6403988629 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403988629 is an equidigital number, since it uses as much as digits as its factorization.

6403988629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The square root of 6403988629 is about 80024.9250483873. The cubic root of 6403988629 is about 1857.0211528436.

The spelling of 6403988629 in words is "six billion, four hundred three million, nine hundred eighty-eight thousand, six hundred twenty-nine".