18679645 has 4 divisors (see below), whose sum is σ = 22415580. Its totient is φ = 14943712.

The previous prime is 18679643. The next prime is 18679649. The reversal of 18679645 is 54697681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3849444 + 14830201 = 1962^2 + 3851^2 .

It is a cyclic number.

It is not a de Polignac number, because 18679645 - 2¹ = 18679643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18679595 and 18679604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18679643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1867960 + ... + 1867969.

It is an arithmetic number, because the mean of its divisors is an integer number (5603895).

Almost surely, 2^18679645 is an apocalyptic number.

It is an amenable number.

18679645 is a deficient number, since it is larger than the sum of its proper divisors (3735935).

18679645 is an equidigital number, since it uses as much as digits as its factorization.

18679645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735934.

The product of its digits is 362880, while the sum is 46.

The square root of 18679645 is about 4321.9954881976. The cubic root of 18679645 is about 265.3319442969.

The spelling of 18679645 in words is "eighteen million, six hundred seventy-nine thousand, six hundred forty-five".