18360840 has 64 divisors (see below), whose sum is σ = 57988800. Its totient is φ = 4637952.

The previous prime is 18360827. The next prime is 18360841. The reversal of 18360840 is 4806381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18360798 and 18360807.

It is not an unprimeable number, because it can be changed into a prime (18360841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1747 + ... + 6306.

It is an arithmetic number, because the mean of its divisors is an integer number (906075).

Almost surely, 2^18360840 is an apocalyptic number.

18360840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18360840 is an abundant number, since it is smaller than the sum of its proper divisors (39627960).

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

18360840 is a wasteful number, since it uses less digits than its factorization.

18360840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8086 (or 8082 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18360840 is about 4284.9550756105. The cubic root of 18360840 is about 263.8138035110.

The spelling of 18360840 in words is "eighteen million, three hundred sixty thousand, eight hundred forty".