18969233 has 2 divisors, whose sum is σ = 18969234. Its totient is φ = 18969232.

The previous prime is 18969221. The next prime is 18969253. The reversal of 18969233 is 33296981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18861649 + 107584 = 4343^2 + 328^2 .

It is an emirp because it is prime and its reverse (33296981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18969233 - 2⁶ = 18969169 is a prime.

It is not a weakly prime, because it can be changed into another prime (18969253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9484616 + 9484617.

It is an arithmetic number, because the mean of its divisors is an integer number (9484617).

Almost surely, 2^18969233 is an apocalyptic number.

It is an amenable number.

18969233 is a deficient number, since it is larger than the sum of its proper divisors (1).

18969233 is an equidigital number, since it uses as much as digits as its factorization.

18969233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 18969233 is about 4355.3682967115. The cubic root of 18969233 is about 266.6960542266.

The spelling of 18969233 in words is "eighteen million, nine hundred sixty-nine thousand, two hundred thirty-three".