18010440 has 144 divisors (see below), whose sum is σ = 68157180. Its totient is φ = 4112640.

The previous prime is 18010387. The next prime is 18010451. The reversal of 18010440 is 4401081.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 15876 = 4242^2 + 126^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17130 + ... + 18150.

Almost surely, 2^18010440 is an apocalyptic number.

18010440 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 18010440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34078590).

18010440 is an abundant number, since it is smaller than the sum of its proper divisors (50146740).

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

18010440 is a wasteful number, since it uses less digits than its factorization.

18010440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052 (or 1038 counting only the distinct ones).

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

The square root of 18010440 is about 4243.8708745672. The cubic root of 18010440 is about 262.1247972953.

The spelling of 18010440 in words is "eighteen million, ten thousand, four hundred forty".