388609493 has 4 divisors (see below), whose sum is σ = 389460300. Its totient is φ = 387758688.

The previous prime is 388609471. The next prime is 388609499. The reversal of 388609493 is 394906883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318015889 + 70593604 = 17833^2 + 8402^2 .

It is a cyclic number.

It is not a de Polignac number, because 388609493 - 2¹⁴ = 388593109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388609499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424718 + ... + 425631.

It is an arithmetic number, because the mean of its divisors is an integer number (97365075).

Almost surely, 2^388609493 is an apocalyptic number.

It is an amenable number.

388609493 is a deficient number, since it is larger than the sum of its proper divisors (850807).

388609493 is an equidigital number, since it uses as much as digits as its factorization.

388609493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850806.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 388609493 is about 19713.1806921156. The cubic root of 388609493 is about 729.7450119630.

The spelling of 388609493 in words is "three hundred eighty-eight million, six hundred nine thousand, four hundred ninety-three".