18030440 has 16 divisors (see below), whose sum is σ = 40568580. Its totient is φ = 7212160.

The previous prime is 18030427. The next prime is 18030451. The reversal of 18030440 is 4403081.

It can be written as a sum of positive squares in 2 ways, for example, as 17926756 + 103684 = 4234^2 + 322^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225341 + ... + 225420.

Almost surely, 2^18030440 is an apocalyptic number.

18030440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18030440 is an abundant number, since it is smaller than the sum of its proper divisors (22538140).

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

18030440 is a wasteful number, since it uses less digits than its factorization.

18030440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450772 (or 450768 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18030440 is about 4246.2265601355. The cubic root of 18030440 is about 262.2217883849.

The spelling of 18030440 in words is "eighteen million, thirty thousand, four hundred forty".