18307413 has 6 divisors (see below), whose sum is σ = 26444054. Its totient is φ = 12204936.

The previous prime is 18307411. The next prime is 18307417. The reversal of 18307413 is 31470381.

It can be written as a sum of positive squares in only one way, i.e., 9199089 + 9108324 = 3033^2 + 3018^2 .

It is not a de Polignac number, because 18307413 - 2¹ = 18307411 is a prime.

It is a super-2 number, since 2×18307413² = 670322741505138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18307411) 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 5 ways as a sum of consecutive naturals, for example, 1017070 + ... + 1017087.

Almost surely, 2^18307413 is an apocalyptic number.

It is an amenable number.

18307413 is a deficient number, since it is larger than the sum of its proper divisors (8136641).

18307413 is a wasteful number, since it uses less digits than its factorization.

18307413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034163 (or 2034160 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18307413 is about 4278.7162794464. The cubic root of 18307413 is about 263.5576701064.

Adding to 18307413 its reverse (31470381), we get a palindrome (49777794).

The spelling of 18307413 in words is "eighteen million, three hundred seven thousand, four hundred thirteen".