18454913 has 4 divisors (see below), whose sum is σ = 18526980. Its totient is φ = 18382848.

The previous prime is 18454883. The next prime is 18454927. The reversal of 18454913 is 31945481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31945481 = 499 ⋅64019.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 7118224 = 3367^2 + 2668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18454913 is a prime.

It is a super-3 number, since 3×18454913³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18454963) 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, 35648 + ... + 36161.

It is an arithmetic number, because the mean of its divisors is an integer number (4631745).

Almost surely, 2^18454913 is an apocalyptic number.

It is an amenable number.

18454913 is a deficient number, since it is larger than the sum of its proper divisors (72067).

18454913 is an equidigital number, since it uses as much as digits as its factorization.

18454913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72066.

The product of its digits is 17280, while the sum is 35.

The square root of 18454913 is about 4295.9181789229. The cubic root of 18454913 is about 264.2635921377.

The spelling of 18454913 in words is "eighteen million, four hundred fifty-four thousand, nine hundred thirteen".