18441945 has 16 divisors (see below), whose sum is σ = 32785920. Its totient is φ = 9835632.

The previous prime is 18441937. The next prime is 18441949. The reversal of 18441945 is 54914481.

It is not a de Polignac number, because 18441945 - 2³ = 18441937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18441949) 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 15 ways as a sum of consecutive naturals, for example, 68169 + ... + 68438.

It is an arithmetic number, because the mean of its divisors is an integer number (2049120).

Almost surely, 2^18441945 is an apocalyptic number.

18441945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18441945 is a deficient number, since it is larger than the sum of its proper divisors (14343975).

18441945 is a wasteful number, since it uses less digits than its factorization.

18441945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136621 (or 136615 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18441945 is about 4294.4085739482. The cubic root of 18441945 is about 264.2016795678.

The spelling of 18441945 in words is "eighteen million, four hundred forty-one thousand, nine hundred forty-five".