16215998 has 4 divisors (see below), whose sum is σ = 24324000. Its totient is φ = 8107998.

The previous prime is 16215967. The next prime is 16216009. The reversal of 16215998 is 89951261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89951261 = 6637 ⋅13553.

It is a super-2 number, since 2×16215998² = 525917182272008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4053998 + ... + 4054001.

It is an arithmetic number, because the mean of its divisors is an integer number (6081000).

Almost surely, 2^16215998 is an apocalyptic number.

16215998 is a deficient number, since it is larger than the sum of its proper divisors (8108002).

16215998 is an equidigital number, since it uses as much as digits as its factorization.

16215998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108001.

The product of its digits is 38880, while the sum is 41.

The square root of 16215998 is about 4026.9092366230. The cubic root of 16215998 is about 253.1130637668.

The spelling of 16215998 in words is "sixteen million, two hundred fifteen thousand, nine hundred ninety-eight".