18299140 has 48 divisors (see below), whose sum is σ = 41150592. Its totient is φ = 6811136.

The previous prime is 18299119. The next prime is 18299143. The reversal of 18299140 is 4199281.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 18299096 and 18299105.

It is not an unprimeable number, because it can be changed into a prime (18299143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36129 + ... + 36631.

It is an arithmetic number, because the mean of its divisors is an integer number (857304).

Almost surely, 2^18299140 is an apocalyptic number.

18299140 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 18299140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20575296).

18299140 is an abundant number, since it is smaller than the sum of its proper divisors (22851452).

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

18299140 is a wasteful number, since it uses less digits than its factorization.

18299140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18299140 is about 4277.7494082753. The cubic root of 18299140 is about 263.5179641300.

The spelling of 18299140 in words is "eighteen million, two hundred ninety-nine thousand, one hundred forty".