388949987 has 24 divisors (see below), whose sum is σ = 441062496. Its totient is φ = 341040128.

The previous prime is 388949983. The next prime is 388949989. The reversal of 388949987 is 789949883.

It is not a de Polignac number, because 388949987 - 2² = 388949983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388949983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2838983 + ... + 2839119.

It is an arithmetic number, because the mean of its divisors is an integer number (18377604).

Almost surely, 2^388949987 is an apocalyptic number.

388949987 is a deficient number, since it is larger than the sum of its proper divisors (52112509).

388949987 is a wasteful number, since it uses less digits than its factorization.

388949987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 230 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 65.

The square root of 388949987 is about 19721.8150026817. The cubic root of 388949987 is about 729.9580804101.

The spelling of 388949987 in words is "three hundred eighty-eight million, nine hundred forty-nine thousand, nine hundred eighty-seven".