18131346 has 12 divisors (see below), whose sum is σ = 39284622. Its totient is φ = 6043776.

The previous prime is 18131303. The next prime is 18131359. The reversal of 18131346 is 64313181.

It can be written as a sum of positive squares in only one way, i.e., 14175225 + 3956121 = 3765^2 + 1989^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 503631 + ... + 503666.

Almost surely, 2^18131346 is an apocalyptic number.

18131346 is an abundant number, since it is smaller than the sum of its proper divisors (21153276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18131346 is a wasteful number, since it uses less digits than its factorization.

18131346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007305 (or 1007302 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 18131346 is about 4258.0918261588. The cubic root of 18131346 is about 262.7100468462.

The spelling of 18131346 in words is "eighteen million, one hundred thirty-one thousand, three hundred forty-six".