18131960 has 144 divisors (see below), whose sum is σ = 53618760. Its totient is φ = 5456640.

The previous prime is 18131951. The next prime is 18131977. The reversal of 18131960 is 6913181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 625226 + ... + 625254.

Almost surely, 2^18131960 is an apocalyptic number.

18131960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18131960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26809380).

18131960 is an abundant number, since it is smaller than the sum of its proper divisors (35486800).

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

18131960 is a wasteful number, since it uses less digits than its factorization.

18131960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 18131960 is about 4258.1639235708. The cubic root of 18131960 is about 262.7130122842.

It can be divided in two parts, 18131 and 960, that added together give a palindrome (19091).

The spelling of 18131960 in words is "eighteen million, one hundred thirty-one thousand, nine hundred sixty".