18629645 has 4 divisors (see below), whose sum is σ = 22355580. Its totient is φ = 14903712.

The previous prime is 18629627. The next prime is 18629657. The reversal of 18629645 is 54692681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54692681 = 313 ⋅174737.

It can be written as a sum of positive squares in 2 ways, for example, as 5248681 + 13380964 = 2291^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 18629645 - 2¹² = 18625549 is a prime.

It is a super-3 number, since 3×18629645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1862960 + ... + 1862969.

It is an arithmetic number, because the mean of its divisors is an integer number (5588895).

Almost surely, 2^18629645 is an apocalyptic number.

It is an amenable number.

18629645 is a deficient number, since it is larger than the sum of its proper divisors (3725935).

18629645 is an equidigital number, since it uses as much as digits as its factorization.

18629645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725934.

The product of its digits is 103680, while the sum is 41.

The square root of 18629645 is about 4316.2072471094. The cubic root of 18629645 is about 265.0949938303.

The spelling of 18629645 in words is "eighteen million, six hundred twenty-nine thousand, six hundred forty-five".