18349873 has 2 divisors, whose sum is σ = 18349874. Its totient is φ = 18349872.

The previous prime is 18349867. The next prime is 18349897. The reversal of 18349873 is 37894381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12723489 + 5626384 = 3567^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 18349873 - 2⁹ = 18349361 is a prime.

It is a super-2 number, since 2×18349873² = 673435678232258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18349853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9174936 + 9174937.

It is an arithmetic number, because the mean of its divisors is an integer number (9174937).

Almost surely, 2^18349873 is an apocalyptic number.

It is an amenable number.

18349873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18349873 is an equidigital number, since it uses as much as digits as its factorization.

18349873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 18349873 is about 4283.6751744267. The cubic root of 18349873 is about 263.7612673848.

The spelling of 18349873 in words is "eighteen million, three hundred forty-nine thousand, eight hundred seventy-three".