388606861 has 2 divisors, whose sum is σ = 388606862. Its totient is φ = 388606860.

The previous prime is 388606853. The next prime is 388606879. The reversal of 388606861 is 168606883.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253000836 + 135606025 = 15906^2 + 11645^2 .

It is a cyclic number.

It is not a de Polignac number, because 388606861 - 2³ = 388606853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388606811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194303430 + 194303431.

It is an arithmetic number, because the mean of its divisors is an integer number (194303431).

Almost surely, 2^388606861 is an apocalyptic number.

It is an amenable number.

388606861 is a deficient number, since it is larger than the sum of its proper divisors (1).

388606861 is an equidigital number, since it uses as much as digits as its factorization.

388606861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 388606861 is about 19713.1139346375. The cubic root of 388606861 is about 729.7433644709.

The spelling of 388606861 in words is "three hundred eighty-eight million, six hundred six thousand, eight hundred sixty-one".