1387866120 has 32 divisors (see below), whose sum is σ = 4163598720. Its totient is φ = 370097600.

The previous prime is 1387866091. The next prime is 1387866143. The reversal of 1387866120 is 216687831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5782656 + ... + 5782895.

It is an arithmetic number, because the mean of its divisors is an integer number (130112460).

Almost surely, 2^1387866120 is an apocalyptic number.

1387866120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387866120 is an abundant number, since it is smaller than the sum of its proper divisors (2775732600).

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

1387866120 is a wasteful number, since it uses less digits than its factorization.

1387866120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11565565 (or 11565561 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1387866120 is about 37254.0752133240. The cubic root of 1387866120 is about 1115.4476461396.

The spelling of 1387866120 in words is "one billion, three hundred eighty-seven million, eight hundred sixty-six thousand, one hundred twenty".