18964487 has 2 divisors, whose sum is σ = 18964488. Its totient is φ = 18964486.

The previous prime is 18964483. The next prime is 18964507. The reversal of 18964487 is 78446981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18964487 - 2² = 18964483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18964481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9482243 + 9482244.

It is an arithmetic number, because the mean of its divisors is an integer number (9482244).

Almost surely, 2^18964487 is an apocalyptic number.

18964487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18964487 is an equidigital number, since it uses as much as digits as its factorization.

18964487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The square root of 18964487 is about 4354.8234177748. The cubic root of 18964487 is about 266.6738103989.

The spelling of 18964487 in words is "eighteen million, nine hundred sixty-four thousand, four hundred eighty-seven".