388195040809 has 9 divisors (see below), whose sum is σ = 389385591517. Its totient is φ = 387008124844.

The previous prime is 388195040797. The next prime is 388195040843. The reversal of 388195040809 is 908040591883.

The square root of 388195040809 is 623053.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-388195040809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 388195040809.

It is not an unprimeable number, because it can be changed into a prime (388195047809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261058464 + ... + 261059950.

Almost surely, 2^388195040809 is an apocalyptic number.

388195040809 is the 623053-rd square number.

388195040809 is the 311527-th centered octagonal number.

It is an amenable number.

388195040809 is a deficient number, since it is larger than the sum of its proper divisors (1190550708).

388195040809 is an frugal number, since it uses more digits than its factorization.

388195040809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 388195040809 in words is "three hundred eighty-eight billion, one hundred ninety-five million, forty thousand, eight hundred nine".