18145474 has 16 divisors (see below), whose sum is σ = 28320120. Its totient is φ = 8709120.

The previous prime is 18145471. The next prime is 18145481. The reversal of 18145474 is 47454181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15721225 + 2424249 = 3965^2 + 1557^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18145471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10384 + ... + 12004.

Almost surely, 2^18145474 is an apocalyptic number.

18145474 is a deficient number, since it is larger than the sum of its proper divisors (10174646).

18145474 is a wasteful number, since it uses less digits than its factorization.

18145474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845.

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

The square root of 18145474 is about 4259.7504621750. The cubic root of 18145474 is about 262.7782639537.

The spelling of 18145474 in words is "eighteen million, one hundred forty-five thousand, four hundred seventy-four".