18208963 has 2 divisors, whose sum is σ = 18208964. Its totient is φ = 18208962.

The previous prime is 18208951. The next prime is 18208979. The reversal of 18208963 is 36980281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18208963 - 2⁹ = 18208451 is a prime.

It is not a weakly prime, because it can be changed into another prime (18208903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9104481 + 9104482.

It is an arithmetic number, because the mean of its divisors is an integer number (9104482).

Almost surely, 2^18208963 is an apocalyptic number.

18208963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18208963 is an equidigital number, since it uses as much as digits as its factorization.

18208963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18208963 is about 4267.1961520418. The cubic root of 18208963 is about 263.0843845322.

It can be divided in two parts, 18 and 208963, that added together give a triangular number (208981 = T₆₄₆).

The spelling of 18208963 in words is "eighteen million, two hundred eight thousand, nine hundred sixty-three".