18405713 has 8 divisors (see below), whose sum is σ = 19809000. Its totient is φ = 17038080.

The previous prime is 18405707. The next prime is 18405719. The reversal of 18405713 is 31750481.

It is an interprime number because it is at equal distance from previous prime (18405707) and next prime (18405719).

It can be written as a sum of positive squares in 4 ways, for example, as 18769 + 18386944 = 137^2 + 4288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18405713 - 2⁴ = 18405697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18405719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7838 + ... + 9911.

It is an arithmetic number, because the mean of its divisors is an integer number (2476125).

Almost surely, 2^18405713 is an apocalyptic number.

It is an amenable number.

18405713 is a deficient number, since it is larger than the sum of its proper divisors (1403287).

18405713 is a wasteful number, since it uses less digits than its factorization.

18405713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17827.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 18405713 is about 4290.1879912190. The cubic root of 18405713 is about 264.0285447020.

The spelling of 18405713 in words is "eighteen million, four hundred five thousand, seven hundred thirteen".