1387805540 has 48 divisors (see below), whose sum is σ = 3366365184. Its totient is φ = 474969600.

The previous prime is 1387805539. The next prime is 1387805563. The reversal of 1387805540 is 455087831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181796 + ... + 189275.

It is an arithmetic number, because the mean of its divisors is an integer number (70132608).

Almost surely, 2^1387805540 is an apocalyptic number.

1387805540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387805540 is an abundant number, since it is smaller than the sum of its proper divisors (1978559644).

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

1387805540 is a wasteful number, since it uses less digits than its factorization.

1387805540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371108 (or 371106 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 1387805540 is about 37253.2621390396. The cubic root of 1387805540 is about 1115.4314162356.

The spelling of 1387805540 in words is "one billion, three hundred eighty-seven million, eight hundred five thousand, five hundred forty".