18069389 has 8 divisors (see below), whose sum is σ = 19494552. Its totient is φ = 16649280.

The previous prime is 18069371. The next prime is 18069473. The reversal of 18069389 is 98396081.

It can be written as a sum of positive squares in 4 ways, for example, as 6889 + 18062500 = 83^2 + 4250^2 .

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 18069389 - 2²⁰ = 17020813 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 (18069319) 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, 9827 + ... + 11519.

It is an arithmetic number, because the mean of its divisors is an integer number (2436819).

Almost surely, 2^18069389 is an apocalyptic number.

It is an amenable number.

18069389 is a deficient number, since it is larger than the sum of its proper divisors (1425163).

18069389 is a wasteful number, since it uses less digits than its factorization.

18069389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18069389 is about 4250.8103933250. The cubic root of 18069389 is about 262.4104680303.

The spelling of 18069389 in words is "eighteen million, sixty-nine thousand, three hundred eighty-nine".