18964369 has 2 divisors, whose sum is σ = 18964370. Its totient is φ = 18964368.

The previous prime is 18964349. The next prime is 18964399. The reversal of 18964369 is 96346981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17114769 + 1849600 = 4137^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 18964369 - 2²¹ = 16867217 is a prime.

It is a super-2 number, since 2×18964369² = 719294583136322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18964349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9482184 + 9482185.

It is an arithmetic number, because the mean of its divisors is an integer number (9482185).

Almost surely, 2^18964369 is an apocalyptic number.

It is an amenable number.

18964369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18964369 is an equidigital number, since it uses as much as digits as its factorization.

18964369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 18964369 is about 4354.8098695580. The cubic root of 18964369 is about 266.6732573024.

The spelling of 18964369 in words is "eighteen million, nine hundred sixty-four thousand, three hundred sixty-nine".