18872419 has 2 divisors, whose sum is σ = 18872420. Its totient is φ = 18872418.

The previous prime is 18872411. The next prime is 18872429. The reversal of 18872419 is 91427881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18872419 - 2³ = 18872411 is a prime.

It is a super-2 number, since 2×18872419² = 712336397823122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18872411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436209 + 9436210.

It is an arithmetic number, because the mean of its divisors is an integer number (9436210).

Almost surely, 2^18872419 is an apocalyptic number.

18872419 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872419 is an equidigital number, since it uses as much as digits as its factorization.

18872419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 18872419 is about 4344.2397493693. The cubic root of 18872419 is about 266.2415645310.

It can be divided in two parts, 18872 and 419, that added together give a palindrome (19291).

The spelling of 18872419 in words is "eighteen million, eight hundred seventy-two thousand, four hundred nineteen".