18725789 has 4 divisors (see below), whose sum is σ = 19827324. Its totient is φ = 17624256.

The previous prime is 18725779. The next prime is 18725803. The reversal of 18725789 is 98752781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98752781 = 47 ⋅2101123.

It can be written as a sum of positive squares in 2 ways, for example, as 15077689 + 3648100 = 3883^2 + 1910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18725789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550742 + ... + 550775.

It is an arithmetic number, because the mean of its divisors is an integer number (4956831).

Almost surely, 2^18725789 is an apocalyptic number.

It is an amenable number.

18725789 is a deficient number, since it is larger than the sum of its proper divisors (1101535).

18725789 is a wasteful number, since it uses less digits than its factorization.

18725789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101534.

The product of its digits is 282240, while the sum is 47.

The square root of 18725789 is about 4327.3304703940. The cubic root of 18725789 is about 265.5502462585.

The spelling of 18725789 in words is "eighteen million, seven hundred twenty-five thousand, seven hundred eighty-nine".