388688011 has 4 divisors (see below), whose sum is σ = 389667472. Its totient is φ = 387708552.

The previous prime is 388687993. The next prime is 388688023. The reversal of 388688011 is 110886883.

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

It is a cyclic number.

It is not a de Polignac number, because 388688011 - 2²¹ = 386590859 is a prime.

It is a super-2 number, since 2×388688011² = 302156739790272242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388688081) 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, 489135 + ... + 489928.

It is an arithmetic number, because the mean of its divisors is an integer number (97416868).

Almost surely, 2^388688011 is an apocalyptic number.

388688011 is a deficient number, since it is larger than the sum of its proper divisors (979461).

388688011 is an equidigital number, since it uses as much as digits as its factorization.

388688011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979460.

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 388688011 is about 19715.1721017089. The cubic root of 388688011 is about 729.7941566367.

The spelling of 388688011 in words is "three hundred eighty-eight million, six hundred eighty-eight thousand, eleven".