18147445 has 8 divisors (see below), whose sum is σ = 21813336. Its totient is φ = 14493696.

The previous prime is 18147421. The next prime is 18147457. The reversal of 18147445 is 54474181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4435236 + 13712209 = 2106^2 + 3703^2 .

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-18147445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18147445.

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, 669 + ... + 6061.

It is an arithmetic number, because the mean of its divisors is an integer number (2726667).

Almost surely, 2^18147445 is an apocalyptic number.

It is an amenable number.

18147445 is a deficient number, since it is larger than the sum of its proper divisors (3665891).

18147445 is an equidigital number, since it uses as much as digits as its factorization.

18147445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6071.

The product of its digits is 17920, while the sum is 34.

The square root of 18147445 is about 4259.9818074729. The cubic root of 18147445 is about 262.7877781206.

The spelling of 18147445 in words is "eighteen million, one hundred forty-seven thousand, four hundred forty-five".