18672419 has 2 divisors, whose sum is σ = 18672420. Its totient is φ = 18672418.

The previous prime is 18672413. The next prime is 18672461. The reversal of 18672419 is 91427681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18672419 - 2¹² = 18668323 is a prime.

It is a super-2 number, since 2×18672419² = 697318462623122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18672413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336209 + 9336210.

It is an arithmetic number, because the mean of its divisors is an integer number (9336210).

Almost surely, 2^18672419 is an apocalyptic number.

18672419 is a deficient number, since it is larger than the sum of its proper divisors (1).

18672419 is an equidigital number, since it uses as much as digits as its factorization.

18672419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 18672419 is about 4321.1594508882. The cubic root of 18672419 is about 265.2977263748.

It can be divided in two parts, 18672 and 419, that added together give a palindrome (19091).

The spelling of 18672419 in words is "eighteen million, six hundred seventy-two thousand, four hundred nineteen".