18478619 has 2 divisors, whose sum is σ = 18478620. Its totient is φ = 18478618.

The previous prime is 18478589. The next prime is 18478679. The reversal of 18478619 is 91687481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18478619 - 2⁸ = 18478363 is a prime.

It is a super-2 number, since 2×18478619² = 682918720294322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18478619.

It is not a weakly prime, because it can be changed into another prime (18478679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9239309 + 9239310.

It is an arithmetic number, because the mean of its divisors is an integer number (9239310).

Almost surely, 2^18478619 is an apocalyptic number.

18478619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18478619 is an equidigital number, since it uses as much as digits as its factorization.

18478619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 18478619 is about 4298.6764242032. The cubic root of 18478619 is about 264.3766957549.

The spelling of 18478619 in words is "eighteen million, four hundred seventy-eight thousand, six hundred nineteen".