18827449 has 4 divisors (see below), whose sum is σ = 19934964. Its totient is φ = 17719936.

The previous prime is 18827441. The next prime is 18827453. The reversal of 18827449 is 94472881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94472881 = 67 ⋅1410043.

It can be written as a sum of positive squares in 2 ways, for example, as 8791225 + 10036224 = 2965^2 + 3168^2 .

It is a cyclic number.

It is not a de Polignac number, because 18827449 - 2³ = 18827441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18827441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553732 + ... + 553765.

It is an arithmetic number, because the mean of its divisors is an integer number (4983741).

Almost surely, 2^18827449 is an apocalyptic number.

It is an amenable number.

18827449 is a deficient number, since it is larger than the sum of its proper divisors (1107515).

18827449 is a wasteful number, since it uses less digits than its factorization.

18827449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107514.

The product of its digits is 129024, while the sum is 43.

The square root of 18827449 is about 4339.0608430857. The cubic root of 18827449 is about 266.0299257793.

The spelling of 18827449 in words is "eighteen million, eight hundred twenty-seven thousand, four hundred forty-nine".