388387681 has 8 divisors (see below), whose sum is σ = 423838944. Its totient is φ = 352960320.

The previous prime is 388387673. The next prime is 388387697. The reversal of 388387681 is 186783883.

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 388387681 - 2³ = 388387673 is a prime.

It is a super-2 number, since 2×388387681² = 301689981505115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388385681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56050 + ... + 62596.

It is an arithmetic number, because the mean of its divisors is an integer number (52979868).

Almost surely, 2^388387681 is an apocalyptic number.

It is an amenable number.

388387681 is a deficient number, since it is larger than the sum of its proper divisors (35451263).

388387681 is a wasteful number, since it uses less digits than its factorization.

388387681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11951.

The product of its digits is 1548288, while the sum is 52.

The square root of 388387681 is about 19707.5539070682. The cubic root of 388387681 is about 729.6061433299.

The spelling of 388387681 in words is "three hundred eighty-eight million, three hundred eighty-seven thousand, six hundred eighty-one".