388085861 has 2 divisors, whose sum is σ = 388085862. Its totient is φ = 388085860.

The previous prime is 388085837. The next prime is 388085903. The reversal of 388085861 is 168580883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246333025 + 141752836 = 15695^2 + 11906^2 .

It is a cyclic number.

It is not a de Polignac number, because 388085861 - 2¹⁴ = 388069477 is a prime.

It is a super-2 number, since 2×388085861² = 301221271016222642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388085161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194042930 + 194042931.

It is an arithmetic number, because the mean of its divisors is an integer number (194042931).

Almost surely, 2^388085861 is an apocalyptic number.

It is an amenable number.

388085861 is a deficient number, since it is larger than the sum of its proper divisors (1).

388085861 is an equidigital number, since it uses as much as digits as its factorization.

388085861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 47.

The square root of 388085861 is about 19699.8949489585. The cubic root of 388085861 is about 729.4170995780.

The spelling of 388085861 in words is "three hundred eighty-eight million, eighty-five thousand, eight hundred sixty-one".