18660940 has 12 divisors (see below), whose sum is σ = 39188016. Its totient is φ = 7464368.

The previous prime is 18660931. The next prime is 18660953. The reversal of 18660940 is 4906681.

It is a junction number, because it is equal to n+sod(n) for n = 18660896 and 18660905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466504 + ... + 466543.

It is an arithmetic number, because the mean of its divisors is an integer number (3265668).

Almost surely, 2^18660940 is an apocalyptic number.

18660940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18660940 is an abundant number, since it is smaller than the sum of its proper divisors (20527076).

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

18660940 is a wasteful number, since it uses less digits than its factorization.

18660940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933056 (or 933054 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18660940 is about 4319.8310152134. The cubic root of 18660940 is about 265.2433506873.

It can be divided in two parts, 18660 and 940, that added together give a square (19600 = 140²).

The spelling of 18660940 in words is "eighteen million, six hundred sixty thousand, nine hundred forty".