18499447 has 2 divisors, whose sum is σ = 18499448. Its totient is φ = 18499446.

The previous prime is 18499433. The next prime is 18499489. The reversal of 18499447 is 74499481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18499447 - 2⁷ = 18499319 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18499397 and 18499406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18490447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249723 + 9249724.

It is an arithmetic number, because the mean of its divisors is an integer number (9249724).

Almost surely, 2^18499447 is an apocalyptic number.

18499447 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499447 is an equidigital number, since it uses as much as digits as its factorization.

18499447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 18499447 is about 4301.0983480967. The cubic root of 18499447 is about 264.4759883530.

The spelling of 18499447 in words is "eighteen million, four hundred ninety-nine thousand, four hundred forty-seven".