18486473 has 2 divisors, whose sum is σ = 18486474. Its totient is φ = 18486472.

The previous prime is 18486469. The next prime is 18486491. The reversal of 18486473 is 37468481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15936064 + 2550409 = 3992^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 18486473 - 2² = 18486469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18486473.

It is not a weakly prime, because it can be changed into another prime (18486443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9243236 + 9243237.

It is an arithmetic number, because the mean of its divisors is an integer number (9243237).

Almost surely, 2^18486473 is an apocalyptic number.

It is an amenable number.

18486473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18486473 is an equidigital number, since it uses as much as digits as its factorization.

18486473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 41.

The square root of 18486473 is about 4299.5898641615. The cubic root of 18486473 is about 264.4141466137.

The spelling of 18486473 in words is "eighteen million, four hundred eighty-six thousand, four hundred seventy-three".