18709513 has 4 divisors (see below), whose sum is σ = 18856960. Its totient is φ = 18562068.

The previous prime is 18709499. The next prime is 18709517. The reversal of 18709513 is 31590781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18709513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18709517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73533 + ... + 73786.

It is an arithmetic number, because the mean of its divisors is an integer number (4714240).

Almost surely, 2^18709513 is an apocalyptic number.

It is an amenable number.

18709513 is a deficient number, since it is larger than the sum of its proper divisors (147447).

18709513 is a wasteful number, since it uses less digits than its factorization.

18709513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147446.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18709513 is about 4325.4494564149. The cubic root of 18709513 is about 265.4732873538.

The spelling of 18709513 in words is "eighteen million, seven hundred nine thousand, five hundred thirteen".