6438538426 has 4 divisors (see below), whose sum is σ = 9657807642. Its totient is φ = 3219269212.

The previous prime is 6438538423. The next prime is 6438538427. The reversal of 6438538426 is 6248358346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6248358346 = 2 ⋅3124179173.

It can be written as a sum of positive squares in only one way, i.e., 6412005625 + 26532801 = 80075^2 + 5151^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6438538426.

It is not an unprimeable number, because it can be changed into a prime (6438538423) 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, 1609634605 + ... + 1609634608.

Almost surely, 2^6438538426 is an apocalyptic number.

6438538426 is a deficient number, since it is larger than the sum of its proper divisors (3219269216).

6438538426 is a wasteful number, since it uses less digits than its factorization.

6438538426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219269215.

The product of its digits is 3317760, while the sum is 49.

The square root of 6438538426 is about 80240.5036499647. The cubic root of 6438538426 is about 1860.3547350161.

The spelling of 6438538426 in words is "six billion, four hundred thirty-eight million, five hundred thirty-eight thousand, four hundred twenty-six".