18646121 has 8 divisors (see below), whose sum is σ = 20162184. Its totient is φ = 17141760.

The previous prime is 18646079. The next prime is 18646129. The reversal of 18646121 is 12164681.

It can be written as a sum of positive squares in 4 ways, for example, as 3279721 + 15366400 = 1811^2 + 3920^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18646121 - 2¹⁸ = 18383977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18646129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551 + ... + 6131.

It is an arithmetic number, because the mean of its divisors is an integer number (2520273).

Almost surely, 2^18646121 is an apocalyptic number.

It is an amenable number.

18646121 is a deficient number, since it is larger than the sum of its proper divisors (1516063).

18646121 is a wasteful number, since it uses less digits than its factorization.

18646121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851.

The product of its digits is 2304, while the sum is 29.

The square root of 18646121 is about 4318.1154454229. The cubic root of 18646121 is about 265.1731205321.

The spelling of 18646121 in words is "eighteen million, six hundred forty-six thousand, one hundred twenty-one".