18706540 has 48 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 7229120.

The previous prime is 18706463. The next prime is 18706549. The reversal of 18706540 is 4560781.

It is not an unprimeable number, because it can be changed into a prime (18706549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97845 + ... + 98035.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^18706540 is an apocalyptic number.

18706540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18706540 is an abundant number, since it is smaller than the sum of its proper divisors (21936020).

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

18706540 is a wasteful number, since it uses less digits than its factorization.

18706540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 18706540 is about 4325.1057790533. The cubic root of 18706540 is about 265.4592250976.

The spelling of 18706540 in words is "eighteen million, seven hundred six thousand, five hundred forty".