18806413 has 8 divisors (see below), whose sum is σ = 19930680. Its totient is φ = 17713920.

The previous prime is 18806399. The next prime is 18806419. The reversal of 18806413 is 31460881.

It can be written as a sum of positive squares in 4 ways, for example, as 2184484 + 16621929 = 1478^2 + 4077^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18806413 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 (18806419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6720 + ... + 9097.

It is an arithmetic number, because the mean of its divisors is an integer number (2491335).

Almost surely, 2^18806413 is an apocalyptic number.

It is an amenable number.

18806413 is a deficient number, since it is larger than the sum of its proper divisors (1124267).

18806413 is a wasteful number, since it uses less digits than its factorization.

18806413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15887.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18806413 is about 4336.6361387601. The cubic root of 18806413 is about 265.9308100142.

The spelling of 18806413 in words is "eighteen million, eight hundred six thousand, four hundred thirteen".