15998755 has 4 divisors (see below), whose sum is σ = 19198512. Its totient is φ = 12799000.

The previous prime is 15998743. The next prime is 15998783. The reversal of 15998755 is 55789951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55789951 = 7 ⋅7969993.

It is a de Polignac number, because none of the positive numbers 2^k-15998755 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15998699 and 15998708.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1599871 + ... + 1599880.

It is an arithmetic number, because the mean of its divisors is an integer number (4799628).

Almost surely, 2^15998755 is an apocalyptic number.

15998755 is a deficient number, since it is larger than the sum of its proper divisors (3199757).

15998755 is an equidigital number, since it uses as much as digits as its factorization.

15998755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199756.

The product of its digits is 567000, while the sum is 49.

The square root of 15998755 is about 3999.8443719725. The cubic root of 15998755 is about 251.9776739690.

The spelling of 15998755 in words is "fifteen million, nine hundred ninety-eight thousand, seven hundred fifty-five".