1387534491840 has 448 divisors, whose sum is σ = 5296702233600. Its totient is φ = 301021937664.

The previous prime is 1387534491817. The next prime is 1387534491859. The reversal of 1387534491840 is 481944357831.

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11437582 + ... + 11558258.

Almost surely, 2^{1387534491840} is an apocalyptic number.

1387534491840 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 1387534491840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2648351116800).

1387534491840 is an abundant number, since it is smaller than the sum of its proper divisors (3909167741760).

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

1387534491840 is a wasteful number, since it uses less digits than its factorization.

1387534491840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120792 (or 120782 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 1387534491840 in words is "one trillion, three hundred eighty-seven billion, five hundred thirty-four million, four hundred ninety-one thousand, eight hundred forty".