18872565 has 8 divisors (see below), whose sum is σ = 30196128. Its totient is φ = 10065360.

The previous prime is 18872561. The next prime is 18872569. The reversal of 18872565 is 56527881.

It is an interprime number because it is at equal distance from previous prime (18872561) and next prime (18872569).

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

It is not a de Polignac number, because 18872565 - 2² = 18872561 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629071 + ... + 629100.

It is an arithmetic number, because the mean of its divisors is an integer number (3774516).

Almost surely, 2^18872565 is an apocalyptic number.

18872565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18872565 is a deficient number, since it is larger than the sum of its proper divisors (11323563).

18872565 is a wasteful number, since it uses less digits than its factorization.

18872565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258179.

The product of its digits is 134400, while the sum is 42.

The square root of 18872565 is about 4344.2565531976. The cubic root of 18872565 is about 266.2422510915.

The spelling of 18872565 in words is "eighteen million, eight hundred seventy-two thousand, five hundred sixty-five".