388746987 has 4 divisors (see below), whose sum is σ = 518329320. Its totient is φ = 259164656.

The previous prime is 388746977. The next prime is 388746991. The reversal of 388746987 is 789647883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789647883 = 3 ⋅263215961.

It is a cyclic number.

It is not a de Polignac number, because 388746987 - 2⁴ = 388746971 is a prime.

It is a super-2 number, since 2×388746987² = 302248439803156338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 388746987.

It is not an unprimeable number, because it can be changed into a prime (388746907) 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 3 ways as a sum of consecutive naturals, for example, 64791162 + ... + 64791167.

It is an arithmetic number, because the mean of its divisors is an integer number (129582330).

Almost surely, 2^388746987 is an apocalyptic number.

388746987 is a deficient number, since it is larger than the sum of its proper divisors (129582333).

388746987 is a wasteful number, since it uses less digits than its factorization.

388746987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129582332.

The product of its digits is 16257024, while the sum is 60.

The square root of 388746987 is about 19716.6677458439. The cubic root of 388746987 is about 729.8310655562.

The spelling of 388746987 in words is "three hundred eighty-eight million, seven hundred forty-six thousand, nine hundred eighty-seven".