388157971 has 2 divisors, whose sum is σ = 388157972. Its totient is φ = 388157970.

The previous prime is 388157927. The next prime is 388157981. The reversal of 388157971 is 179751883.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 388157971 - 2⁹ = 388157459 is a prime.

It is a super-2 number, since 2×388157971² = 301333220901673682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (388157981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194078985 + 194078986.

It is an arithmetic number, because the mean of its divisors is an integer number (194078986).

Almost surely, 2^388157971 is an apocalyptic number.

388157971 is a deficient number, since it is larger than the sum of its proper divisors (1).

388157971 is an equidigital number, since it uses as much as digits as its factorization.

388157971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 49.

The square root of 388157971 is about 19701.7250767541. The cubic root of 388157971 is about 729.4622742974.

The spelling of 388157971 in words is "three hundred eighty-eight million, one hundred fifty-seven thousand, nine hundred seventy-one".