18609481 has 4 divisors (see below), whose sum is σ = 20301264. Its totient is φ = 16917700.

The previous prime is 18609473. The next prime is 18609499. The reversal of 18609481 is 18490681.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 18609481 - 2³ = 18609473 is a prime.

It is a super-2 number, since 2×18609481² = 692625566178722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18609481.

It is not an unprimeable number, because it can be changed into a prime (18609401) 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, 845875 + ... + 845896.

It is an arithmetic number, because the mean of its divisors is an integer number (5075316).

Almost surely, 2^18609481 is an apocalyptic number.

18609481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18609481 is a deficient number, since it is larger than the sum of its proper divisors (1691783).

18609481 is a wasteful number, since it uses less digits than its factorization.

18609481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691782.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18609481 is about 4313.8707676517. The cubic root of 18609481 is about 264.9993164810. Note that the first 3 decimals are identical.

The spelling of 18609481 in words is "eighteen million, six hundred nine thousand, four hundred eighty-one".