18621713 has 4 divisors (see below), whose sum is σ = 20314608. Its totient is φ = 16928820.

The previous prime is 18621703. The next prime is 18621719. The reversal of 18621713 is 31712681.

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 not a de Polignac number, because 18621713 - 2⁶ = 18621649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18621719) 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, 846431 + ... + 846452.

It is an arithmetic number, because the mean of its divisors is an integer number (5078652).

Almost surely, 2^18621713 is an apocalyptic number.

It is an amenable number.

18621713 is a deficient number, since it is larger than the sum of its proper divisors (1692895).

18621713 is a wasteful number, since it uses less digits than its factorization.

18621713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692894.

The product of its digits is 2016, while the sum is 29.

The square root of 18621713 is about 4315.2882870093. The cubic root of 18621713 is about 265.0573650583.

The spelling of 18621713 in words is "eighteen million, six hundred twenty-one thousand, seven hundred thirteen".