18215841 has 16 divisors (see below), whose sum is σ = 27895808. Its totient is φ = 10357200.

The previous prime is 18215801. The next prime is 18215843. The reversal of 18215841 is 14851281.

It is a happy number.

It is not a de Polignac number, because 18215841 - 2⁶ = 18215777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18215799 and 18215808.

It is not an unprimeable number, because it can be changed into a prime (18215843) 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 15 ways as a sum of consecutive naturals, for example, 2376 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (1743488).

Almost surely, 2^18215841 is an apocalyptic number.

It is an amenable number.

18215841 is a deficient number, since it is larger than the sum of its proper divisors (9679967).

18215841 is a wasteful number, since it uses less digits than its factorization.

18215841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332.

The product of its digits is 2560, while the sum is 30.

The square root of 18215841 is about 4268.0019915647. The cubic root of 18215841 is about 263.1175049725.

The spelling of 18215841 in words is "eighteen million, two hundred fifteen thousand, eight hundred forty-one".