18578340 has 108 divisors (see below), whose sum is σ = 62015772. Its totient is φ = 4498560.

The previous prime is 18578327. The next prime is 18578341. The reversal of 18578340 is 4387581.

It can be written as a sum of positive squares in 2 ways, for example, as 3415104 + 15163236 = 1848^2 + 3894^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18578295 and 18578304.

It is not an unprimeable number, because it can be changed into a prime (18578341) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21354 + ... + 22206.

Almost surely, 2^18578340 is an apocalyptic number.

18578340 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 18578340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31007886).

18578340 is an abundant number, since it is smaller than the sum of its proper divisors (43437432).

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

18578340 is a wasteful number, since it uses less digits than its factorization.

18578340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 18578340 is about 4310.2598529555. The cubic root of 18578340 is about 264.8514178347.

The spelling of 18578340 in words is "eighteen million, five hundred seventy-eight thousand, three hundred forty".