1388487806738 has 54 divisors (see below), whose sum is σ = 2160838837269. Its totient is φ = 669143361744.

The previous prime is 1388487806689. The next prime is 1388487806749. The reversal of 1388487806738 is 8376087848831.

It can be written as a sum of positive squares in 2 ways, for example, as 1317061502689 + 71426304049 = 1147633^2 + 267257^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=833213.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6977325563 + ... + 6977325761.

Almost surely, 2^{1388487806738} is an apocalyptic number.

1388487806738 is a deficient number, since it is larger than the sum of its proper divisors (772351030531).

1388487806738 is an frugal number, since it uses more digits than its factorization.

1388487806738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 346816512, while the sum is 71.

The spelling of 1388487806738 in words is "one trillion, three hundred eighty-eight billion, four hundred eighty-seven million, eight hundred six thousand, seven hundred thirty-eight".