18142240 has 48 divisors (see below), whose sum is σ = 43205400. Its totient is φ = 7198720.

The previous prime is 18142231. The next prime is 18142253. The reversal of 18142240 is 4224181.

It can be written as a sum of positive squares in 4 ways, for example, as 4511376 + 13630864 = 2124^2 + 3692^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23460 + ... + 24220.

Almost surely, 2^18142240 is an apocalyptic number.

18142240 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 18142240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21602700).

18142240 is an abundant number, since it is smaller than the sum of its proper divisors (25063160).

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

18142240 is a wasteful number, since it uses less digits than its factorization.

18142240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 18142240 is about 4259.3708455592. The cubic root of 18142240 is about 262.7626516969.

The spelling of 18142240 in words is "eighteen million, one hundred forty-two thousand, two hundred forty".