18002215 has 64 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 10074240.

The previous prime is 18002189. The next prime is 18002233. The reversal of 18002215 is 51220081.

It is not a de Polignac number, because 18002215 - 2¹³ = 17994023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 18002192 and 18002201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 168192 + ... + 168298.

It is an arithmetic number, because the mean of its divisors is an integer number (466560).

Almost surely, 2^18002215 is an apocalyptic number.

18002215 is a deficient number, since it is larger than the sum of its proper divisors (11857625).

18002215 is a wasteful number, since it uses less digits than its factorization.

18002215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18002215 is about 4242.9017193426. The cubic root of 18002215 is about 262.0848888729.

Adding to 18002215 its reverse (51220081), we get a palindrome (69222296).

The spelling of 18002215 in words is "eighteen million, two thousand, two hundred fifteen".