388705387 has 12 divisors (see below), whose sum is σ = 464390400. Its totient is φ = 324169776.

The previous prime is 388705349. The next prime is 388705397. The reversal of 388705387 is 783507883.

It is not a de Polignac number, because 388705387 - 2⁷ = 388705259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 388705387.

It is not an unprimeable number, because it can be changed into a prime (388705397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105387 + ... + 109012.

It is an arithmetic number, because the mean of its divisors is an integer number (38699200).

Almost surely, 2^388705387 is an apocalyptic number.

388705387 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

388705387 is a deficient number, since it is larger than the sum of its proper divisors (75685013).

388705387 is a wasteful number, since it uses less digits than its factorization.

388705387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214450 (or 214443 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 388705387 is about 19715.6127726226. The cubic root of 388705387 is about 729.8050314377.

The spelling of 388705387 in words is "three hundred eighty-eight million, seven hundred five thousand, three hundred eighty-seven".