18880019 has 2 divisors, whose sum is σ = 18880020. Its totient is φ = 18880018.

The previous prime is 18880007. The next prime is 18880021. The reversal of 18880019 is 91008881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18880019 is a prime.

It is a super-2 number, since 2×18880019² = 712910234880722, which contains 22 as substring.

Together with 18880021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18880219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440009 + 9440010.

It is an arithmetic number, because the mean of its divisors is an integer number (9440010).

Almost surely, 2^18880019 is an apocalyptic number.

18880019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18880019 is an equidigital number, since it uses as much as digits as its factorization.

18880019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 18880019 is about 4345.1143828443. The cubic root of 18880019 is about 266.2772985889.

The spelling of 18880019 in words is "eighteen million, eight hundred eighty thousand, nineteen".