18298397 has 4 divisors (see below), whose sum is σ = 19705980. Its totient is φ = 16890816.

The previous prime is 18298393. The next prime is 18298411. The reversal of 18298397 is 79389281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 942841 + 17355556 = 971^2 + 4166^2 .

It is a cyclic number.

It is not a de Polignac number, because 18298397 - 2² = 18298393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18298393) 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 3 ways as a sum of consecutive naturals, for example, 703772 + ... + 703797.

It is an arithmetic number, because the mean of its divisors is an integer number (4926495).

Almost surely, 2^18298397 is an apocalyptic number.

It is an amenable number.

18298397 is a deficient number, since it is larger than the sum of its proper divisors (1407583).

18298397 is a wasteful number, since it uses less digits than its factorization.

18298397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407582.

The product of its digits is 217728, while the sum is 47.

The square root of 18298397 is about 4277.6625626620. The cubic root of 18298397 is about 263.5143975417.

The spelling of 18298397 in words is "eighteen million, two hundred ninety-eight thousand, three hundred ninety-seven".