388109693 has 2 divisors, whose sum is σ = 388109694. Its totient is φ = 388109692.

The previous prime is 388109663. The next prime is 388109717. The reversal of 388109693 is 396901883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278656249 + 109453444 = 16693^2 + 10462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388109693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388109653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194054846 + 194054847.

It is an arithmetic number, because the mean of its divisors is an integer number (194054847).

Almost surely, 2^388109693 is an apocalyptic number.

It is an amenable number.

388109693 is a deficient number, since it is larger than the sum of its proper divisors (1).

388109693 is an equidigital number, since it uses as much as digits as its factorization.

388109693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 388109693 is about 19700.4998159945. The cubic root of 388109693 is about 729.4320302195.

The spelling of 388109693 in words is "three hundred eighty-eight million, one hundred nine thousand, six hundred ninety-three".