388500981 has 16 divisors (see below), whose sum is σ = 589662720. Its totient is φ = 225217520.

The previous prime is 388500979. The next prime is 388500991. The reversal of 388500981 is 189005883.

It is not a de Polignac number, because 388500981 - 2¹ = 388500979 is a prime.

It is a super-2 number, since 2×388500981² = 301866024475924722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388500991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255171 + ... + 256688.

It is an arithmetic number, because the mean of its divisors is an integer number (36853920).

Almost surely, 2^388500981 is an apocalyptic number.

It is an amenable number.

388500981 is a deficient number, since it is larger than the sum of its proper divisors (201161739).

388500981 is a wasteful number, since it uses less digits than its factorization.

388500981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511896.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 388500981 is about 19710.4282297468. The cubic root of 388500981 is about 729.6770830491.

The spelling of 388500981 in words is "three hundred eighty-eight million, five hundred thousand, nine hundred eighty-one".