1387281846820 has 12 divisors (see below), whose sum is σ = 2913291878364. Its totient is φ = 554912738720.

The previous prime is 1387281846793. The next prime is 1387281846883. The reversal of 1387281846820 is 286481827831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 910665586944 + 476616259876 = 954288^2 + 690374^2 .

It is a super-2 number, since 2×1387281846820² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34682046151 + ... + 34682046190.

It is an arithmetic number, because the mean of its divisors is an integer number (242774323197).

Almost surely, 2^{1387281846820} is an apocalyptic number.

1387281846820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387281846820 is an abundant number, since it is smaller than the sum of its proper divisors (1526010031544).

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

1387281846820 is a wasteful number, since it uses less digits than its factorization.

1387281846820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69364092350 (or 69364092348 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 58.

The spelling of 1387281846820 in words is "one trillion, three hundred eighty-seven billion, two hundred eighty-one million, eight hundred forty-six thousand, eight hundred twenty".