388706081 has 4 divisors (see below), whose sum is σ = 396040212. Its totient is φ = 381371952.

The previous prime is 388706077. The next prime is 388706089. The reversal of 388706081 is 180607883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 197824225 + 190881856 = 14065^2 + 13816^2 .

It is a cyclic number.

It is not a de Polignac number, because 388706081 - 2² = 388706077 is a prime.

It is a super-2 number, since 2×388706081² = 302184834812757122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388706089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3666986 + ... + 3667091.

It is an arithmetic number, because the mean of its divisors is an integer number (99010053).

Almost surely, 2^388706081 is an apocalyptic number.

It is an amenable number.

388706081 is a deficient number, since it is larger than the sum of its proper divisors (7334131).

388706081 is an equidigital number, since it uses as much as digits as its factorization.

388706081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334130.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 388706081 is about 19715.6303728793. The cubic root of 388706081 is about 729.8054657722.

The spelling of 388706081 in words is "three hundred eighty-eight million, seven hundred six thousand, eighty-one".