15668387 has 6 divisors (see below), whose sum is σ = 18226548. Its totient is φ = 13430004.

The previous prime is 15668377. The next prime is 15668413. The reversal of 15668387 is 78386651.

It is not a de Polignac number, because 15668387 - 2¹⁰ = 15667363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15668347) 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 in 5 ways as a sum of consecutive naturals, for example, 159833 + ... + 159930.

It is an arithmetic number, because the mean of its divisors is an integer number (3037758).

Almost surely, 2^15668387 is an apocalyptic number.

15668387 is a deficient number, since it is larger than the sum of its proper divisors (2558161).

15668387 is an equidigital number, since it uses as much as digits as its factorization.

15668387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319777 (or 319770 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 15668387 is about 3958.3313403504. The cubic root of 15668387 is about 250.2311834842.

The spelling of 15668387 in words is "fifteen million, six hundred sixty-eight thousand, three hundred eighty-seven".