18131040 has 120 divisors (see below), whose sum is σ = 64033200. Its totient is φ = 4831488.

The previous prime is 18131039. The next prime is 18131051. The reversal of 18131040 is 4013181.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×18131040² = 657469222963200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12261 + ... + 13659.

It is an arithmetic number, because the mean of its divisors is an integer number (533610).

Almost surely, 2^18131040 is an apocalyptic number.

18131040 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 18131040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32016600).

18131040 is an abundant number, since it is smaller than the sum of its proper divisors (45902160).

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

18131040 is a wasteful number, since it uses less digits than its factorization.

18131040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18131040 is about 4258.0558944194. The cubic root of 18131040 is about 262.7085689319.

The spelling of 18131040 in words is "eighteen million, one hundred thirty-one thousand, forty".