388847947 has 2 divisors, whose sum is σ = 388847948. Its totient is φ = 388847946.

The previous prime is 388847933. The next prime is 388847971. The reversal of 388847947 is 749748883.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388847947 is a prime.

It is a super-2 number, since 2×388847947² = 302405451772229618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 388847891 and 388847900.

It is not a weakly prime, because it can be changed into another prime (388842947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194423973 + 194423974.

It is an arithmetic number, because the mean of its divisors is an integer number (194423974).

Almost surely, 2^388847947 is an apocalyptic number.

388847947 is a deficient number, since it is larger than the sum of its proper divisors (1).

388847947 is an equidigital number, since it uses as much as digits as its factorization.

388847947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 58.

The square root of 388847947 is about 19719.2278499945. The cubic root of 388847947 is about 729.8942406367.

The spelling of 388847947 in words is "three hundred eighty-eight million, eight hundred forty-seven thousand, nine hundred forty-seven".