6396434388 has 18 divisors (see below), whose sum is σ = 16168764794. Its totient is φ = 2132144784.

The previous prime is 6396434381. The next prime is 6396434413. The reversal of 6396434388 is 8834346936.

It can be written as a sum of positive squares in only one way, i.e., 5391671184 + 1004763204 = 73428^2 + 31698^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6396434381) 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 in 5 ways as a sum of consecutive naturals, for example, 88839331 + ... + 88839402.

Almost surely, 2^6396434388 is an apocalyptic number.

It is an amenable number.

6396434388 is an abundant number, since it is smaller than the sum of its proper divisors (9772330406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6396434388 is a wasteful number, since it uses less digits than its factorization.

6396434388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177678743 (or 177678738 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The square root of 6396434388 is about 79977.7118202315. The cubic root of 6396434388 is about 1856.2906755431.

The spelling of 6396434388 in words is "six billion, three hundred ninety-six million, four hundred thirty-four thousand, three hundred eighty-eight".