18479731 has 8 divisors (see below), whose sum is σ = 19836144. Its totient is φ = 17153280.

The previous prime is 18479729. The next prime is 18479743. The reversal of 18479731 is 13797481.

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 18479731 - 2¹ = 18479729 is a prime.

It is a super-2 number, since 2×18479731² = 683000915664722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18479231) 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, 6205 + ... + 8686.

It is an arithmetic number, because the mean of its divisors is an integer number (2479518).

Almost surely, 2^18479731 is an apocalyptic number.

18479731 is a deficient number, since it is larger than the sum of its proper divisors (1356413).

18479731 is a wasteful number, since it uses less digits than its factorization.

18479731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14981.

The product of its digits is 42336, while the sum is 40.

The square root of 18479731 is about 4298.8057643955. The cubic root of 18479731 is about 264.3819988385.

The spelling of 18479731 in words is "eighteen million, four hundred seventy-nine thousand, seven hundred thirty-one".