18466249 has 2 divisors, whose sum is σ = 18466250. Its totient is φ = 18466248.

The previous prime is 18466237. The next prime is 18466291. The reversal of 18466249 is 94266481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 446224 = 4245^2 + 668^2 .

It is an emirp because it is prime and its reverse (94266481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18466249 - 2¹³ = 18458057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18466229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9233124 + 9233125.

It is an arithmetic number, because the mean of its divisors is an integer number (9233125).

Almost surely, 2^18466249 is an apocalyptic number.

It is an amenable number.

18466249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18466249 is an equidigital number, since it uses as much as digits as its factorization.

18466249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 18466249 is about 4297.2373683566. The cubic root of 18466249 is about 264.3176893658.

The spelling of 18466249 in words is "eighteen million, four hundred sixty-six thousand, two hundred forty-nine".