18963389 has 2 divisors, whose sum is σ = 18963390. Its totient is φ = 18963388.

The previous prime is 18963377. The next prime is 18963401. The reversal of 18963389 is 98336981.

It is a balanced prime because it is at equal distance from previous prime (18963377) and next prime (18963401).

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 7198489 = 3430^2 + 2683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18963389 is a prime.

It is a super-2 number, since 2×18963389² = 719220244730642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18965389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9481694 + 9481695.

It is an arithmetic number, because the mean of its divisors is an integer number (9481695).

Almost surely, 2^18963389 is an apocalyptic number.

It is an amenable number.

18963389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18963389 is an equidigital number, since it uses as much as digits as its factorization.

18963389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 18963389 is about 4354.6973488407. The cubic root of 18963389 is about 266.6686637003.

The spelling of 18963389 in words is "eighteen million, nine hundred sixty-three thousand, three hundred eighty-nine".