18678619 has 4 divisors (see below), whose sum is σ = 18696744. Its totient is φ = 18660496.

The previous prime is 18678607. The next prime is 18678623. The reversal of 18678619 is 91687681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91687681 = 17 ⋅5393393.

It is a cyclic number.

It is not a de Polignac number, because 18678619 - 2⁵ = 18678587 is a prime.

It is a super-2 number, since 2×18678619² = 697781615494322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18678629) 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, 7417 + ... + 9610.

It is an arithmetic number, because the mean of its divisors is an integer number (4674186).

Almost surely, 2^18678619 is an apocalyptic number.

18678619 is a deficient number, since it is larger than the sum of its proper divisors (18125).

18678619 is a wasteful number, since it uses less digits than its factorization.

18678619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18124.

The product of its digits is 145152, while the sum is 46.

The square root of 18678619 is about 4321.8767913951. The cubic root of 18678619 is about 265.3270863252.

The spelling of 18678619 in words is "eighteen million, six hundred seventy-eight thousand, six hundred nineteen".