18970933 has 2 divisors, whose sum is σ = 18970934. Its totient is φ = 18970932.

The previous prime is 18970927. The next prime is 18970937. The reversal of 18970933 is 33907981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18722929 + 248004 = 4327^2 + 498^2 .

It is an emirp because it is prime and its reverse (33907981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18970933 - 2¹⁷ = 18839861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18970937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9485466 + 9485467.

It is an arithmetic number, because the mean of its divisors is an integer number (9485467).

Almost surely, 2^18970933 is an apocalyptic number.

It is an amenable number.

18970933 is a deficient number, since it is larger than the sum of its proper divisors (1).

18970933 is an equidigital number, since it uses as much as digits as its factorization.

18970933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18970933 is about 4355.5634537910. The cubic root of 18970933 is about 266.7040209825.

The spelling of 18970933 in words is "eighteen million, nine hundred seventy thousand, nine hundred thirty-three".