1387668540 has 24 divisors (see below), whose sum is σ = 3885472080. Its totient is φ = 370044928.

The previous prime is 1387668539. The next prime is 1387668599. The reversal of 1387668540 is 458667831.

1387668540 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1387668540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11563845 + ... + 11563964.

It is an arithmetic number, because the mean of its divisors is an integer number (161894670).

Almost surely, 2^1387668540 is an apocalyptic number.

1387668540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387668540 is an abundant number, since it is smaller than the sum of its proper divisors (2497803540).

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

1387668540 is a wasteful number, since it uses less digits than its factorization.

1387668540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23127821 (or 23127819 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 1387668540 is about 37251.4233285119. The cubic root of 1387668540 is about 1115.3947110132.

The spelling of 1387668540 in words is "one billion, three hundred eighty-seven million, six hundred sixty-eight thousand, five hundred forty".