18459649 has 4 divisors (see below), whose sum is σ = 19879636. Its totient is φ = 17039664.

The previous prime is 18459641. The next prime is 18459653. The reversal of 18459649 is 94695481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94695481 = 4649 ⋅20369.

It can be written as a sum of positive squares in 2 ways, for example, as 5607424 + 12852225 = 2368^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 18459649 - 2³ = 18459641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18459599 and 18459608.

It is not an unprimeable number, because it can be changed into a prime (18459641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709974 + ... + 709999.

It is an arithmetic number, because the mean of its divisors is an integer number (4969909).

Almost surely, 2^18459649 is an apocalyptic number.

It is an amenable number.

18459649 is a deficient number, since it is larger than the sum of its proper divisors (1419987).

18459649 is a wasteful number, since it uses less digits than its factorization.

18459649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419986.

The product of its digits is 311040, while the sum is 46.

The square root of 18459649 is about 4296.4693644899. The cubic root of 18459649 is about 264.2861957903.

The spelling of 18459649 in words is "eighteen million, four hundred fifty-nine thousand, six hundred forty-nine".