18945140 has 24 divisors (see below), whose sum is σ = 42125832. Its totient is φ = 7132160.

The previous prime is 18945139. The next prime is 18945151. The reversal of 18945140 is 4154981.

It can be written as a sum of positive squares in 4 ways, for example, as 10523536 + 8421604 = 3244^2 + 2902^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18945097 and 18945106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27521 + ... + 28200.

It is an arithmetic number, because the mean of its divisors is an integer number (1755243).

Almost surely, 2^18945140 is an apocalyptic number.

18945140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18945140 is an abundant number, since it is smaller than the sum of its proper divisors (23180692).

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

18945140 is a wasteful number, since it uses less digits than its factorization.

18945140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55747 (or 55745 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18945140 is about 4352.6015209298. The cubic root of 18945140 is about 266.5830953399.

The spelling of 18945140 in words is "eighteen million, nine hundred forty-five thousand, one hundred forty".