388885777 has 4 divisors (see below), whose sum is σ = 444440896. Its totient is φ = 333330660.

The previous prime is 388885769. The next prime is 388885807. The reversal of 388885777 is 777588883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 777588883 = 131 ⋅5935793.

It is a cyclic number.

It is not a de Polignac number, because 388885777 - 2³ = 388885769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388885877) 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, 27777549 + ... + 27777562.

It is an arithmetic number, because the mean of its divisors is an integer number (111110224).

Almost surely, 2^388885777 is an apocalyptic number.

It is an amenable number.

388885777 is a deficient number, since it is larger than the sum of its proper divisors (55555119).

388885777 is an equidigital number, since it uses as much as digits as its factorization.

388885777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55555118.

The product of its digits is 21073920, while the sum is 61.

The square root of 388885777 is about 19720.1870427235. The cubic root of 388885777 is about 729.9179097032.

The spelling of 388885777 in words is "three hundred eighty-eight million, eight hundred eighty-five thousand, seven hundred seventy-seven".