5398978256438 has 24 divisors (see below), whose sum is σ = 8859752025768. Its totient is φ = 2466147071232.

The previous prime is 5398978256423. The next prime is 5398978256501. The reversal of 5398978256438 is 8346528798935.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82303856 + ... + 82369427.

It is an arithmetic number, because the mean of its divisors is an integer number (369156334407).

Almost surely, 2^{5398978256438} is an apocalyptic number.

5398978256438 is a deficient number, since it is larger than the sum of its proper divisors (3460773769330).

5398978256438 is a wasteful number, since it uses less digits than its factorization.

5398978256438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164673408 (or 164673395 counting only the distinct ones).

The product of its digits is 3135283200, while the sum is 77.

The spelling of 5398978256438 in words is "five trillion, three hundred ninety-eight billion, nine hundred seventy-eight million, two hundred fifty-six thousand, four hundred thirty-eight".