18479531 has 8 divisors (see below), whose sum is σ = 21260544. Its totient is φ = 15733800.

The previous prime is 18479521. The next prime is 18479537. The reversal of 18479531 is 13597481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18479531 is a prime.

It is a super-2 number, since 2×18479531² = 682986131959922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18479537) 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, 7685 + ... + 9798.

It is an arithmetic number, because the mean of its divisors is an integer number (2657568).

Almost surely, 2^18479531 is an apocalyptic number.

18479531 is a deficient number, since it is larger than the sum of its proper divisors (2781013).

18479531 is a wasteful number, since it uses less digits than its factorization.

18479531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17641.

The product of its digits is 30240, while the sum is 38.

The square root of 18479531 is about 4298.7825020580. The cubic root of 18479531 is about 264.3810450622.

The spelling of 18479531 in words is "eighteen million, four hundred seventy-nine thousand, five hundred thirty-one".