18162921 has 8 divisors (see below), whose sum is σ = 27676864. Its totient is φ = 10378800.

The previous prime is 18162913. The next prime is 18162923. The reversal of 18162921 is 12926181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18162921 - 2³ = 18162913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18162923) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 432430 + ... + 432471.

It is an arithmetic number, because the mean of its divisors is an integer number (3459608).

Almost surely, 2^18162921 is an apocalyptic number.

It is an amenable number.

18162921 is a deficient number, since it is larger than the sum of its proper divisors (9513943).

18162921 is an equidigital number, since it uses as much as digits as its factorization.

18162921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864911.

The product of its digits is 1728, while the sum is 30.

The square root of 18162921 is about 4261.7978600586. The cubic root of 18162921 is about 262.8624580205.

It can be divided in two parts, 181629 and 21, that multiplied together give a square (3814209 = 1953²).

The spelling of 18162921 in words is "eighteen million, one hundred sixty-two thousand, nine hundred twenty-one".