18540709 has 12 divisors (see below), whose sum is σ = 20692672. Its totient is φ = 16596360.

The previous prime is 18540707. The next prime is 18540719. The reversal of 18540709 is 90704581.

It is a happy number.

It is not a de Polignac number, because 18540709 - 2¹ = 18540707 is a prime.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6964 + ... + 9250.

Almost surely, 2^18540709 is an apocalyptic number.

It is an amenable number.

18540709 is a deficient number, since it is larger than the sum of its proper divisors (2151963).

18540709 is a wasteful number, since it uses less digits than its factorization.

18540709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376 (or 2365 counting only the distinct ones).

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

The square root of 18540709 is about 4305.8923581530. The cubic root of 18540709 is about 264.6724753939.

The spelling of 18540709 in words is "eighteen million, five hundred forty thousand, seven hundred nine".