18699019 has 2 divisors, whose sum is σ = 18699020. Its totient is φ = 18699018.

The previous prime is 18699013. The next prime is 18699041. The reversal of 18699019 is 91099681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18699019 - 2⁷ = 18698891 is a prime.

It is a super-2 number, since 2×18699019² = 699306623124722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18699013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9349509 + 9349510.

It is an arithmetic number, because the mean of its divisors is an integer number (9349510).

Almost surely, 2^18699019 is an apocalyptic number.

18699019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18699019 is an equidigital number, since it uses as much as digits as its factorization.

18699019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 18699019 is about 4324.2362331399. The cubic root of 18699019 is about 265.4236441999.

The spelling of 18699019 in words is "eighteen million, six hundred ninety-nine thousand, nineteen".