6399428438 has 8 divisors (see below), whose sum is σ = 10337538288. Its totient is φ = 2953582344.

The previous prime is 6399428429. The next prime is 6399428531. The reversal of 6399428438 is 8348249936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123065906 + ... + 123065957.

It is an arithmetic number, because the mean of its divisors is an integer number (1292192286).

Almost surely, 2^6399428438 is an apocalyptic number.

6399428438 is a deficient number, since it is larger than the sum of its proper divisors (3938109850).

6399428438 is a wasteful number, since it uses less digits than its factorization.

6399428438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246131878.

The product of its digits is 8957952, while the sum is 56.

The square root of 6399428438 is about 79996.4276577398. The cubic root of 6399428438 is about 1856.5802618873.

The spelling of 6399428438 in words is "six billion, three hundred ninety-nine million, four hundred twenty-eight thousand, four hundred thirty-eight".