3138978951385 has 8 divisors (see below), whose sum is σ = 3766816505160. Its totient is φ = 2511155318784.

The previous prime is 3138978951323. The next prime is 3138978951397. The reversal of 3138978951385 is 5831598798313.

It can be written as a sum of positive squares in 4 ways, for example, as 70802823744 + 3068176127641 = 266088^2 + 1751621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3138978951385 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2977630 + ... + 3891559.

It is an arithmetic number, because the mean of its divisors is an integer number (470852063145).

Almost surely, 2^{3138978951385} is an apocalyptic number.

It is an amenable number.

3138978951385 is a deficient number, since it is larger than the sum of its proper divisors (627837553775).

3138978951385 is an equidigital number, since it uses as much as digits as its factorization.

3138978951385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6960587.

The product of its digits is 195955200, while the sum is 70.

The spelling of 3138978951385 in words is "three trillion, one hundred thirty-eight billion, nine hundred seventy-eight million, nine hundred fifty-one thousand, three hundred eighty-five".