388780987 has 8 divisors (see below), whose sum is σ = 445123296. Its totient is φ = 332639232.

The previous prime is 388780981. The next prime is 388781011. The reversal of 388780987 is 789087883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 388780987 - 2³ = 388780979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388780981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45958 + ... + 53755.

It is an arithmetic number, because the mean of its divisors is an integer number (55640412).

Almost surely, 2^388780987 is an apocalyptic number.

388780987 is a deficient number, since it is larger than the sum of its proper divisors (56342309).

388780987 is an equidigital number, since it uses as much as digits as its factorization.

388780987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100277.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The square root of 388780987 is about 19717.5299416534. The cubic root of 388780987 is about 729.8523420623.

The spelling of 388780987 in words is "three hundred eighty-eight million, seven hundred eighty thousand, nine hundred eighty-seven".