18825209 has 8 divisors (see below), whose sum is σ = 20372352. Its totient is φ = 17292240.

The previous prime is 18825173. The next prime is 18825211. The reversal of 18825209 is 90252881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18825209 - 2²⁴ = 2047993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18825269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689 + ... + 6174.

It is an arithmetic number, because the mean of its divisors is an integer number (2546544).

Almost surely, 2^18825209 is an apocalyptic number.

It is an amenable number.

18825209 is a deficient number, since it is larger than the sum of its proper divisors (1547143).

18825209 is a wasteful number, since it uses less digits than its factorization.

18825209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7087.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18825209 is about 4338.8027150356. The cubic root of 18825209 is about 266.0193750374.

The spelling of 18825209 in words is "eighteen million, eight hundred twenty-five thousand, two hundred nine".