388142009 has 2 divisors, whose sum is σ = 388142010. Its totient is φ = 388142008.

The previous prime is 388141969. The next prime is 388142033. The reversal of 388142009 is 900241883.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360810025 + 27331984 = 18995^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 388142009 - 2⁸ = 388141753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 388142009.

It is not a weakly prime, because it can be changed into another prime (388142059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194071004 + 194071005.

It is an arithmetic number, because the mean of its divisors is an integer number (194071005).

Almost surely, 2^388142009 is an apocalyptic number.

It is an amenable number.

388142009 is a deficient number, since it is larger than the sum of its proper divisors (1).

388142009 is an equidigital number, since it uses as much as digits as its factorization.

388142009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 388142009 is about 19701.3199811586. The cubic root of 388142009 is about 729.4522750726.

The spelling of 388142009 in words is "three hundred eighty-eight million, one hundred forty-two thousand, nine".