18415413 has 6 divisors (see below), whose sum is σ = 26600054. Its totient is φ = 12276936.

The previous prime is 18415409. The next prime is 18415421. The reversal of 18415413 is 31451481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10614564 + 7800849 = 3258^2 + 2793^2 .

It is not a de Polignac number, because 18415413 - 2² = 18415409 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 (18415213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1023070 + ... + 1023087.

Almost surely, 2^18415413 is an apocalyptic number.

It is an amenable number.

18415413 is a deficient number, since it is larger than the sum of its proper divisors (8184641).

18415413 is a wasteful number, since it uses less digits than its factorization.

18415413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046163 (or 2046160 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 18415413 is about 4291.3183289055. The cubic root of 18415413 is about 264.0749184758.

Adding to 18415413 its reverse (31451481), we get a palindrome (49866894).

The spelling of 18415413 in words is "eighteen million, four hundred fifteen thousand, four hundred thirteen".