18486409 has 4 divisors (see below), whose sum is σ = 18552016. Its totient is φ = 18420804.

The previous prime is 18486397. The next prime is 18486443. The reversal of 18486409 is 90468481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90468481 = 19 ⋅4761499.

It is a cyclic number.

It is not a de Polignac number, because 18486409 - 2¹³ = 18478217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18486469) 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, 32379 + ... + 32944.

It is an arithmetic number, because the mean of its divisors is an integer number (4638004).

Almost surely, 2^18486409 is an apocalyptic number.

It is an amenable number.

18486409 is a deficient number, since it is larger than the sum of its proper divisors (65607).

18486409 is an equidigital number, since it uses as much as digits as its factorization.

18486409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65606.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18486409 is about 4299.5824215847. The cubic root of 18486409 is about 264.4138414803.

The spelling of 18486409 in words is "eighteen million, four hundred eighty-six thousand, four hundred nine".