18681463 has 2 divisors, whose sum is σ = 18681464. Its totient is φ = 18681462.

The previous prime is 18681431. The next prime is 18681491. The reversal of 18681463 is 36418681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18681463 - 2⁵ = 18681431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18681863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9340731 + 9340732.

It is an arithmetic number, because the mean of its divisors is an integer number (9340732).

Almost surely, 2^18681463 is an apocalyptic number.

18681463 is a deficient number, since it is larger than the sum of its proper divisors (1).

18681463 is an equidigital number, since it uses as much as digits as its factorization.

18681463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 18681463 is about 4322.2058025966. The cubic root of 18681463 is about 265.3405518449.

The spelling of 18681463 in words is "eighteen million, six hundred eighty-one thousand, four hundred sixty-three".