1388518678840 has 64 divisors (see below), whose sum is σ = 3204820080000. Its totient is φ = 541106856960.

The previous prime is 1388518678823. The next prime is 1388518678849. The reversal of 1388518678840 is 488768158831.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388518678849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590386 + ... + 1767934.

It is an arithmetic number, because the mean of its divisors is an integer number (50075313750).

Almost surely, 2^{1388518678840} is an apocalyptic number.

1388518678840 is a gapful number since it is divisible by the number (10) 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 1388518678840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1602410040000).

1388518678840 is an abundant number, since it is smaller than the sum of its proper divisors (1816301401160).

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

1388518678840 is a wasteful number, since it uses less digits than its factorization.

1388518678840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178320 (or 1178316 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 67.

The spelling of 1388518678840 in words is "one trillion, three hundred eighty-eight billion, five hundred eighteen million, six hundred seventy-eight thousand, eight hundred forty".