18131486 has 16 divisors (see below), whose sum is σ = 28953936. Its totient is φ = 8486016.

The previous prime is 18131479. The next prime is 18131489. The reversal of 18131486 is 68413181.

18131486 = 200² + 201² + ... + 396².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5345 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (1809621).

Almost surely, 2^18131486 is an apocalyptic number.

18131486 is a deficient number, since it is larger than the sum of its proper divisors (10822450).

18131486 is a wasteful number, since it uses less digits than its factorization.

18131486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923.

The product of its digits is 4608, while the sum is 32.

The square root of 18131486 is about 4258.1082654155. The cubic root of 18131486 is about 262.7107230106.

The spelling of 18131486 in words is "eighteen million, one hundred thirty-one thousand, four hundred eighty-six".