18357445 has 8 divisors (see below), whose sum is σ = 22141944. Its totient is φ = 14610624.

The previous prime is 18357419. The next prime is 18357461. The reversal of 18357445 is 54475381.

It can be written as a sum of positive squares in 4 ways, for example, as 1366561 + 16990884 = 1169^2 + 4122^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18357445 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8334 + ... + 10303.

It is an arithmetic number, because the mean of its divisors is an integer number (2767743).

Almost surely, 2^18357445 is an apocalyptic number.

It is an amenable number.

18357445 is a deficient number, since it is larger than the sum of its proper divisors (3784499).

18357445 is a wasteful number, since it uses less digits than its factorization.

18357445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18839.

The product of its digits is 67200, while the sum is 37.

The square root of 18357445 is about 4284.5589037846. The cubic root of 18357445 is about 263.7975423982.

The spelling of 18357445 in words is "eighteen million, three hundred fifty-seven thousand, four hundred forty-five".