6438875386 has 4 divisors (see below), whose sum is σ = 9658313082. Its totient is φ = 3219437692.

The previous prime is 6438875351. The next prime is 6438875407. The reversal of 6438875386 is 6835788346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5814825025 + 624050361 = 76255^2 + 24981^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6438875386.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609718845 + ... + 1609718848.

Almost surely, 2^6438875386 is an apocalyptic number.

6438875386 is a deficient number, since it is larger than the sum of its proper divisors (3219437696).

6438875386 is a wasteful number, since it uses less digits than its factorization.

6438875386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219437695.

The product of its digits is 23224320, while the sum is 58.

The square root of 6438875386 is about 80242.6033102117. The cubic root of 6438875386 is about 1860.3871882508.

The spelling of 6438875386 in words is "six billion, four hundred thirty-eight million, eight hundred seventy-five thousand, three hundred eighty-six".