1389105631872 has 1536 divisors, whose sum is σ = 5153901696000. Its totient is φ = 366646984704.

The previous prime is 1389105631843. The next prime is 1389105631987. The reversal of 1389105631872 is 2781365019831.

1389105631872 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 1 + 0 + 563 + 1 + 8 + 72 = 666.

It is a super-2 number, since 2×1389105631872² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 15607928404 + ... + 15607928492.

It is an arithmetic number, because the mean of its divisors is an integer number (3355404750).

Almost surely, 2^{1389105631872} is an apocalyptic number.

1389105631872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389105631872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2576950848000).

1389105631872 is an abundant number, since it is smaller than the sum of its proper divisors (3764796064128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389105631872 is a wasteful number, since it uses less digits than its factorization.

1389105631872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 1389105631872 in words is "one trillion, three hundred eighty-nine billion, one hundred five million, six hundred thirty-one thousand, eight hundred seventy-two".