18140040 has 96 divisors (see below), whose sum is σ = 60442200. Its totient is φ = 4715520.

The previous prime is 18140011. The next prime is 18140047. The reversal of 18140040 is 4004181.

It can be written as a sum of positive squares in 4 ways, for example, as 15256836 + 2883204 = 3906^2 + 1698^2 .

It is a super-2 number, since 2×18140040² = 658122102403200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 18139995 and 18140022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14146 + ... + 15374.

Almost surely, 2^18140040 is an apocalyptic number.

18140040 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 18140040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30221100).

18140040 is an abundant number, since it is smaller than the sum of its proper divisors (42302160).

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

18140040 is a wasteful number, since it uses less digits than its factorization.

18140040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18140040 is about 4259.1125836258. The cubic root of 18140040 is about 262.7520300537.

The spelling of 18140040 in words is "eighteen million, one hundred forty thousand, forty".