18698321 has 4 divisors (see below), whose sum is σ = 18710592. Its totient is φ = 18686052.

The previous prime is 18698297. The next prime is 18698371. The reversal of 18698321 is 12389681.

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 a de Polignac number, because none of the positive numbers 2^k-18698321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18698371) 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, 3461 + ... + 7026.

It is an arithmetic number, because the mean of its divisors is an integer number (4677648).

Almost surely, 2^18698321 is an apocalyptic number.

It is an amenable number.

18698321 is a deficient number, since it is larger than the sum of its proper divisors (12271).

18698321 is a wasteful number, since it uses less digits than its factorization.

18698321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12270.

The product of its digits is 20736, while the sum is 38.

The square root of 18698321 is about 4324.1555244926. The cubic root of 18698321 is about 265.4203415666.

The spelling of 18698321 in words is "eighteen million, six hundred ninety-eight thousand, three hundred twenty-one".