18671445 has 32 divisors (see below), whose sum is σ = 35750400. Its totient is φ = 9191232.

The previous prime is 18671407. The next prime is 18671449. The reversal of 18671445 is 54417681.

It is a happy number.

It is not a de Polignac number, because 18671445 - 2⁶ = 18671381 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 (18671449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3565 + ... + 7074.

It is an arithmetic number, because the mean of its divisors is an integer number (1117200).

Almost surely, 2^18671445 is an apocalyptic number.

18671445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18671445 is a deficient number, since it is larger than the sum of its proper divisors (17078955).

18671445 is a wasteful number, since it uses less digits than its factorization.

18671445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666 (or 10660 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 18671445 is about 4321.0467481850. The cubic root of 18671445 is about 265.2931134307.

It can be divided in two parts, 186 and 71445, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 18671445 in words is "eighteen million, six hundred seventy-one thousand, four hundred forty-five".