18455645 has 12 divisors (see below), whose sum is σ = 23982516. Its totient is φ = 13628160.

The previous prime is 18455639. The next prime is 18455651. The reversal of 18455645 is 54655481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18455639) and next prime (18455651).

It can be written as a sum of positive squares in 6 ways, for example, as 10407076 + 8048569 = 3226^2 + 2837^2 .

It is not a de Polignac number, because 18455645 - 2⁶ = 18455581 is a prime.

It is a super-2 number, since 2×18455645² = 681221664732050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18455599 and 18455608.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10076 + ... + 11765.

It is an arithmetic number, because the mean of its divisors is an integer number (1998543).

Almost surely, 2^18455645 is an apocalyptic number.

It is an amenable number.

18455645 is a deficient number, since it is larger than the sum of its proper divisors (5526871).

18455645 is a wasteful number, since it uses less digits than its factorization.

18455645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21872 (or 21859 counting only the distinct ones).

The product of its digits is 96000, while the sum is 38.

The square root of 18455645 is about 4296.0033752314. The cubic root of 18455645 is about 264.2670860292.

The spelling of 18455645 in words is "eighteen million, four hundred fifty-five thousand, six hundred forty-five".