18374445 has 42 divisors (see below), whose sum is σ = 33531054. Its totient is φ = 9661680.

The previous prime is 18374443. The next prime is 18374471. The reversal of 18374445 is 54447381.

It can be written as a sum of positive squares in only one way, i.e., 14699556 + 3674889 = 3834^2 + 1917^2 .

It is not a de Polignac number, because 18374445 - 2¹ = 18374443 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18374441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 258760 + ... + 258830.

Almost surely, 2^18374445 is an apocalyptic number.

18374445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18374445 is a deficient number, since it is larger than the sum of its proper divisors (15156609).

18374445 is an frugal number, since it uses more digits than its factorization.

18374445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 79 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 18374445 is about 4286.5423128671. The cubic root of 18374445 is about 263.8789476013.

The spelling of 18374445 in words is "eighteen million, three hundred seventy-four thousand, four hundred forty-five".