18894019 has 2 divisors, whose sum is σ = 18894020. Its totient is φ = 18894018.

The previous prime is 18893981. The next prime is 18894049. The reversal of 18894019 is 91049881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18894019 is a prime.

It is a super-2 number, since 2×18894019² = 713967907944722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18894049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447009 + 9447010.

It is an arithmetic number, because the mean of its divisors is an integer number (9447010).

Almost surely, 2^18894019 is an apocalyptic number.

18894019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894019 is an equidigital number, since it uses as much as digits as its factorization.

18894019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18894019 is about 4346.7250890757. The cubic root of 18894019 is about 266.3430993899.

It can be divided in two parts, 188940 and 19, that multiplied together give a triangular number (3589860 = T₂₆₇₉).

The spelling of 18894019 in words is "eighteen million, eight hundred ninety-four thousand, nineteen".