1387988960944 has 40 divisors (see below), whose sum is σ = 2953843799040. Its totient is φ = 628882867008.

The previous prime is 1387988960863. The next prime is 1387988960947. The reversal of 1387988960944 is 4490698897831.

It is a super-2 number, since 2×1387988960944² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (76).

It is not an unprimeable number, because it can be changed into a prime (1387988960947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99248512 + ... + 99262495.

It is an arithmetic number, because the mean of its divisors is an integer number (73846094976).

Almost surely, 2^{1387988960944} is an apocalyptic number.

It is an amenable number.

1387988960944 is an abundant number, since it is smaller than the sum of its proper divisors (1565854838096).

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

1387988960944 is a wasteful number, since it uses less digits than its factorization.

1387988960944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198511057 (or 198511051 counting only the distinct ones).

The product of its (nonzero) digits is 752467968, while the sum is 76.

The spelling of 1387988960944 in words is "one trillion, three hundred eighty-seven billion, nine hundred eighty-eight million, nine hundred sixty thousand, nine hundred forty-four".