18709540 has 24 divisors (see below), whose sum is σ = 39457152. Its totient is φ = 7452000.

The previous prime is 18709519. The next prime is 18709573. The reversal of 18709540 is 4590781.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18709496 and 18709505.

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, 3157 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (1644048).

Almost surely, 2^18709540 is an apocalyptic number.

18709540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18709540 is an abundant number, since it is smaller than the sum of its proper divisors (20747612).

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

18709540 is a wasteful number, since it uses less digits than its factorization.

18709540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987 (or 3985 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 18709540 is about 4325.4525774767. The cubic root of 18709540 is about 265.4734150566.

The spelling of 18709540 in words is "eighteen million, seven hundred nine thousand, five hundred forty".