18398047 has 4 divisors (see below), whose sum is σ = 18443440. Its totient is φ = 18352656.

The previous prime is 18398021. The next prime is 18398069. The reversal of 18398047 is 74089381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74089381 = 1523 ⋅48647.

It is a cyclic number.

It is not a de Polignac number, because 18398047 - 2¹¹ = 18395999 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 (18398447) 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, 22083 + ... + 22900.

It is an arithmetic number, because the mean of its divisors is an integer number (4610860).

Almost surely, 2^18398047 is an apocalyptic number.

18398047 is a deficient number, since it is larger than the sum of its proper divisors (45393).

18398047 is an equidigital number, since it uses as much as digits as its factorization.

18398047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45392.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18398047 is about 4289.2944641281. The cubic root of 18398047 is about 263.9918835506.

The spelling of 18398047 in words is "eighteen million, three hundred ninety-eight thousand, forty-seven".