18461413 has 4 divisors (see below), whose sum is σ = 18479340. Its totient is φ = 18443488.

The previous prime is 18461393. The next prime is 18461453. The reversal of 18461413 is 31416481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31416481 = 19 ⋅1653499.

It can be written as a sum of positive squares in 2 ways, for example, as 2196324 + 16265089 = 1482^2 + 4033^2 .

It is a cyclic number.

It is not a de Polignac number, because 18461413 - 2⁹ = 18460901 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 (18461453) 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, 7318 + ... + 9511.

It is an arithmetic number, because the mean of its divisors is an integer number (4619835).

Almost surely, 2^18461413 is an apocalyptic number.

It is an amenable number.

18461413 is a deficient number, since it is larger than the sum of its proper divisors (17927).

18461413 is a wasteful number, since it uses less digits than its factorization.

18461413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17926.

The product of its digits is 2304, while the sum is 28.

The square root of 18461413 is about 4296.6746444198. The cubic root of 18461413 is about 264.2946138991.

Adding to 18461413 its reverse (31416481), we get a palindrome (49877894).

The spelling of 18461413 in words is "eighteen million, four hundred sixty-one thousand, four hundred thirteen".