18348121 has 4 divisors (see below), whose sum is σ = 20016144. Its totient is φ = 16680100.

The previous prime is 18348107. The next prime is 18348133. The reversal of 18348121 is 12184381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18348121 - 2⁷ = 18347993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18348121.

It is not an unprimeable number, because it can be changed into a prime (18348521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833995 + ... + 834016.

It is an arithmetic number, because the mean of its divisors is an integer number (5004036).

Almost surely, 2^18348121 is an apocalyptic number.

18348121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18348121 is a deficient number, since it is larger than the sum of its proper divisors (1668023).

18348121 is a wasteful number, since it uses less digits than its factorization.

18348121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668022.

The product of its digits is 1536, while the sum is 28.

The square root of 18348121 is about 4283.4706722470. The cubic root of 18348121 is about 263.7528726954.

The spelling of 18348121 in words is "eighteen million, three hundred forty-eight thousand, one hundred twenty-one".