18103240 has 32 divisors (see below), whose sum is σ = 41144760. Its totient is φ = 7168000.

The previous prime is 18103237. The next prime is 18103243. The reversal of 18103240 is 4230181.

It is an interprime number because it is at equal distance from previous prime (18103237) and next prime (18103243).

It can be written as a sum of positive squares in 4 ways, for example, as 18096516 + 6724 = 4254^2 + 82^2 .

It is not an unprimeable number, because it can be changed into a prime (18103243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1800 + ... + 6280.

Almost surely, 2^18103240 is an apocalyptic number.

18103240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18103240 is an abundant number, since it is smaller than the sum of its proper divisors (23041520).

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

18103240 is a wasteful number, since it uses less digits than its factorization.

18103240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593 (or 4589 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18103240 is about 4254.7902415983. The cubic root of 18103240 is about 262.5742314629.

It can be divided in two parts, 1810 and 3240, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 18103240 in words is "eighteen million, one hundred three thousand, two hundred forty".