5399138781 has 32 divisors (see below), whose sum is σ = 8615552000. Its totient is φ = 3330666864.

The previous prime is 5399138761. The next prime is 5399138837. The reversal of 5399138781 is 1878319935.

5399138781 is a `hidden beast` number, since 539 + 9 + 1 + 38 + 78 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-5399138781 is a prime.

It is a super-2 number, since 2×5399138781² = 58301399152996331922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5399138761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100321 + ... + 144438.

It is an arithmetic number, because the mean of its divisors is an integer number (269236000).

Almost surely, 2^5399138781 is an apocalyptic number.

It is an amenable number.

5399138781 is a deficient number, since it is larger than the sum of its proper divisors (3216413219).

5399138781 is a wasteful number, since it uses less digits than its factorization.

5399138781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244830 (or 244824 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 5399138781 is about 73478.8321967626. The cubic root of 5399138781 is about 1754.3173705752.

The spelling of 5399138781 in words is "five billion, three hundred ninety-nine million, one hundred thirty-eight thousand, seven hundred eighty-one".