18479945 has 8 divisors (see below), whose sum is σ = 24192000. Its totient is φ = 13439920.

The previous prime is 18479941. The next prime is 18479947. The reversal of 18479945 is 54997481.

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

It is not a de Polignac number, because 18479945 - 2² = 18479941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18479945.

It is not an unprimeable number, because it can be changed into a prime (18479941) 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, 167945 + ... + 168054.

It is an arithmetic number, because the mean of its divisors is an integer number (3024000).

Almost surely, 2^18479945 is an apocalyptic number.

It is an amenable number.

18479945 is a deficient number, since it is larger than the sum of its proper divisors (5712055).

18479945 is a wasteful number, since it uses less digits than its factorization.

18479945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336015.

The product of its digits is 362880, while the sum is 47.

The square root of 18479945 is about 4298.8306549572. The cubic root of 18479945 is about 264.3830193716.

The spelling of 18479945 in words is "eighteen million, four hundred seventy-nine thousand, nine hundred forty-five".