18867613 has 4 divisors (see below), whose sum is σ = 19687968. Its totient is φ = 18047260.

The previous prime is 18867599. The next prime is 18867617. The reversal of 18867613 is 31676881.

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: 31676881 = 53 ⋅597677.

It is a cyclic number.

It is not a de Polignac number, because 18867613 - 2⁵ = 18867581 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 (18867617) 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, 410143 + ... + 410188.

It is an arithmetic number, because the mean of its divisors is an integer number (4921992).

Almost surely, 2^18867613 is an apocalyptic number.

It is an amenable number.

18867613 is a deficient number, since it is larger than the sum of its proper divisors (820355).

18867613 is an equidigital number, since it uses as much as digits as its factorization.

18867613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820354.

The product of its digits is 48384, while the sum is 40.

The square root of 18867613 is about 4343.6865678822. The cubic root of 18867613 is about 266.2189624896.

The spelling of 18867613 in words is "eighteen million, eight hundred sixty-seven thousand, six hundred thirteen".