18709441 has 4 divisors (see below), whose sum is σ = 18721584. Its totient is φ = 18697300.

The previous prime is 18709417. The next prime is 18709447. The reversal of 18709441 is 14490781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14490781 = 113 ⋅128237.

It is a cyclic number.

It is not a de Polignac number, because 18709441 - 2¹⁵ = 18676673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18709397 and 18709406.

It is not an unprimeable number, because it can be changed into a prime (18709447) 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, 3355 + ... + 6976.

It is an arithmetic number, because the mean of its divisors is an integer number (4680396).

Almost surely, 2^18709441 is an apocalyptic number.

It is an amenable number.

18709441 is a deficient number, since it is larger than the sum of its proper divisors (12143).

18709441 is a wasteful number, since it uses less digits than its factorization.

18709441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12142.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18709441 is about 4325.4411335724. The cubic root of 18709441 is about 265.4729468122.

It can be divided in two parts, 1870 and 9441, that added together give a palindrome (11311).

The spelling of 18709441 in words is "eighteen million, seven hundred nine thousand, four hundred forty-one".