18725816 has 8 divisors (see below), whose sum is σ = 35110920. Its totient is φ = 9362904.

The previous prime is 18725809. The next prime is 18725821. The reversal of 18725816 is 61852781.

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18725816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1170356 + ... + 1170371.

It is an arithmetic number, because the mean of its divisors is an integer number (4388865).

Almost surely, 2^18725816 is an apocalyptic number.

It is an amenable number.

18725816 is a deficient number, since it is larger than the sum of its proper divisors (16385104).

18725816 is a wasteful number, since it uses less digits than its factorization.

18725816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340733 (or 2340729 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 18725816 is about 4327.3335900991. Note that the first 3 decimals coincide. The cubic root of 18725816 is about 265.5503738873.

The spelling of 18725816 in words is "eighteen million, seven hundred twenty-five thousand, eight hundred sixteen".