388440673 has 2 divisors, whose sum is σ = 388440674. Its totient is φ = 388440672.

The previous prime is 388440623. The next prime is 388440677. The reversal of 388440673 is 376044883.

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., 385454689 + 2985984 = 19633^2 + 1728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388440673 is a prime.

It is not a weakly prime, because it can be changed into another prime (388440677) 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, 194220336 + 194220337.

It is an arithmetic number, because the mean of its divisors is an integer number (194220337).

Almost surely, 2^388440673 is an apocalyptic number.

It is an amenable number.

388440673 is a deficient number, since it is larger than the sum of its proper divisors (1).

388440673 is an equidigital number, since it uses as much as digits as its factorization.

388440673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 388440673 is about 19708.8983203019. The cubic root of 388440673 is about 729.6393245492.

The spelling of 388440673 in words is "three hundred eighty-eight million, four hundred forty thousand, six hundred seventy-three".