6399239788 has 6 divisors (see below), whose sum is σ = 11198669636. Its totient is φ = 3199619892.

The previous prime is 6399239783. The next prime is 6399239839. The reversal of 6399239788 is 8879329936.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6399239783) 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, 799904970 + ... + 799904977.

Almost surely, 2^6399239788 is an apocalyptic number.

It is an amenable number.

6399239788 is a deficient number, since it is larger than the sum of its proper divisors (4799429848).

6399239788 is a wasteful number, since it uses less digits than its factorization.

6399239788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599809951 (or 1599809949 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 64.

The square root of 6399239788 is about 79995.2485338973. The cubic root of 6399239788 is about 1856.5620182107.

The spelling of 6399239788 in words is "six billion, three hundred ninety-nine million, two hundred thirty-nine thousand, seven hundred eighty-eight".