1387995660 has 36 divisors (see below), whose sum is σ = 4210254048. Its totient is φ = 370132128.

The previous prime is 1387995659. The next prime is 1387995691. The reversal of 1387995660 is 665997831.

1387995660 is a `hidden beast` number, since 1 + 3 + 8 + 79 + 9 + 566 + 0 = 666.

1387995660 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1387995597 and 1387995606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3855364 + ... + 3855723.

Almost surely, 2^1387995660 is an apocalyptic number.

1387995660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387995660 is an abundant number, since it is smaller than the sum of its proper divisors (2822258388).

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

1387995660 is a wasteful number, since it uses less digits than its factorization.

1387995660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7711102 (or 7711097 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 1387995660 is about 37255.8137744970. The cubic root of 1387995660 is about 1115.4823494371.

The spelling of 1387995660 in words is "one billion, three hundred eighty-seven million, nine hundred ninety-five thousand, six hundred sixty".