18137789 has 8 divisors (see below), whose sum is σ = 18831960. Its totient is φ = 17448256.

The previous prime is 18137783. The next prime is 18137797. The reversal of 18137789 is 98773181.

It can be written as a sum of positive squares in 4 ways, for example, as 7225 + 18130564 = 85^2 + 4258^2 .

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

It is not a de Polignac number, because 18137789 - 2¹² = 18133693 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 (18137783) 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, 8207 + ... + 10179.

It is an arithmetic number, because the mean of its divisors is an integer number (2353995).

Almost surely, 2^18137789 is an apocalyptic number.

It is an amenable number.

18137789 is a deficient number, since it is larger than the sum of its proper divisors (694171).

18137789 is a wasteful number, since it uses less digits than its factorization.

18137789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its digits is 84672, while the sum is 44.

The square root of 18137789 is about 4258.8483185011. The cubic root of 18137789 is about 262.7411612925.

The spelling of 18137789 in words is "eighteen million, one hundred thirty-seven thousand, seven hundred eighty-nine".