18440825 has 24 divisors (see below), whose sum is σ = 25706688. Its totient is φ = 13020480.

The previous prime is 18440813. The next prime is 18440831. The reversal of 18440825 is 52804481.

It is a happy number.

It is not a de Polignac number, because 18440825 - 2¹⁶ = 18375289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18440791 and 18440800.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6242 + ... + 8708.

It is an arithmetic number, because the mean of its divisors is an integer number (1071112).

Almost surely, 2^18440825 is an apocalyptic number.

It is an amenable number.

18440825 is a deficient number, since it is larger than the sum of its proper divisors (7265863).

18440825 is a wasteful number, since it uses less digits than its factorization.

18440825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 18440825 is about 4294.2781698441. The cubic root of 18440825 is about 264.1963310381.

The spelling of 18440825 in words is "eighteen million, four hundred forty thousand, eight hundred twenty-five".