388537117 has 4 divisors (see below), whose sum is σ = 395868060. Its totient is φ = 381206176.

The previous prime is 388537081. The next prime is 388537129. The reversal of 388537117 is 711735883.

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 288116676 + 100420441 = 16974^2 + 10021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388537117 is a prime.

It is a super-2 number, since 2×388537117² = 301922182573343378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388537217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665392 + ... + 3665497.

It is an arithmetic number, because the mean of its divisors is an integer number (98967015).

Almost surely, 2^388537117 is an apocalyptic number.

It is an amenable number.

388537117 is a deficient number, since it is larger than the sum of its proper divisors (7330943).

388537117 is an equidigital number, since it uses as much as digits as its factorization.

388537117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7330942.

The product of its digits is 141120, while the sum is 43.

The square root of 388537117 is about 19711.3448805504. The cubic root of 388537117 is about 729.6997057235.

The spelling of 388537117 in words is "three hundred eighty-eight million, five hundred thirty-seven thousand, one hundred seventeen".