388646879 has 2 divisors, whose sum is σ = 388646880. Its totient is φ = 388646878.

The previous prime is 388646873. The next prime is 388646887. The reversal of 388646879 is 978646883.

It is a weak prime.

It is an emirp because it is prime and its reverse (978646883) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388646879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388646873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194323439 + 194323440.

It is an arithmetic number, because the mean of its divisors is an integer number (194323440).

Almost surely, 2^388646879 is an apocalyptic number.

388646879 is a deficient number, since it is larger than the sum of its proper divisors (1).

388646879 is an equidigital number, since it uses as much as digits as its factorization.

388646879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 59.

The square root of 388646879 is about 19714.1289181135. The cubic root of 388646879 is about 729.7684128085.

It can be divided in two parts, 388 and 646879, that multiplied together give a palindrome (250989052).

The spelling of 388646879 in words is "three hundred eighty-eight million, six hundred forty-six thousand, eight hundred seventy-nine".