18149731 has 8 divisors (see below), whose sum is σ = 19158800. Its totient is φ = 17146080.

The previous prime is 18149713. The next prime is 18149743. The reversal of 18149731 is 13794181.

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 18149731 - 2¹⁵ = 18116963 is a prime.

It is a super-2 number, since 2×18149731² = 658825470744722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18149701) 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, 6865 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (2394850).

Almost surely, 2^18149731 is an apocalyptic number.

18149731 is a deficient number, since it is larger than the sum of its proper divisors (1009069).

18149731 is a wasteful number, since it uses less digits than its factorization.

18149731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709.

The product of its digits is 6048, while the sum is 34.

The square root of 18149731 is about 4260.2501100288. The cubic root of 18149731 is about 262.7988119537.

The spelling of 18149731 in words is "eighteen million, one hundred forty-nine thousand, seven hundred thirty-one".