18353945 has 4 divisors (see below), whose sum is σ = 22024740. Its totient is φ = 14683152.

The previous prime is 18353927. The next prime is 18353947. The reversal of 18353945 is 54935381.

It is a happy number.

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 11042329 + 7311616 = 3323^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 18353945 - 2¹⁰ = 18352921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18353899 and 18353908.

It is not an unprimeable number, because it can be changed into a prime (18353947) 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, 1835390 + ... + 1835399.

It is an arithmetic number, because the mean of its divisors is an integer number (5506185).

Almost surely, 2^18353945 is an apocalyptic number.

It is an amenable number.

18353945 is a deficient number, since it is larger than the sum of its proper divisors (3670795).

18353945 is an equidigital number, since it uses as much as digits as its factorization.

18353945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670794.

The product of its digits is 64800, while the sum is 38.

The square root of 18353945 is about 4284.1504408692. The cubic root of 18353945 is about 263.7807762654.

The spelling of 18353945 in words is "eighteen million, three hundred fifty-three thousand, nine hundred forty-five".