18487445 has 8 divisors (see below), whose sum is σ = 22209336. Its totient is φ = 14773696.

The previous prime is 18487429. The next prime is 18487459. The reversal of 18487445 is 54478481.

It can be written as a sum of positive squares in 4 ways, for example, as 6160324 + 12327121 = 2482^2 + 3511^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18487445 - 2⁴ = 18487429 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, 5519 + ... + 8211.

It is an arithmetic number, because the mean of its divisors is an integer number (2776167).

Almost surely, 2^18487445 is an apocalyptic number.

It is an amenable number.

18487445 is a deficient number, since it is larger than the sum of its proper divisors (3721891).

18487445 is a wasteful number, since it uses less digits than its factorization.

18487445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071.

The product of its digits is 143360, while the sum is 41.

The square root of 18487445 is about 4299.7028967127. The cubic root of 18487445 is about 264.4187807417.

The spelling of 18487445 in words is "eighteen million, four hundred eighty-seven thousand, four hundred forty-five".