18641945 has 48 divisors (see below), whose sum is σ = 28882560. Its totient is φ = 11280384.

The previous prime is 18641941. The next prime is 18641947. The reversal of 18641945 is 54914681.

It is not a de Polignac number, because 18641945 - 2² = 18641941 is a prime.

It is a super-2 number, since 2×18641945² = 695044226766050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18641899 and 18641908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18641941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192137 + ... + 192233.

It is an arithmetic number, because the mean of its divisors is an integer number (601720).

Almost surely, 2^18641945 is an apocalyptic number.

It is an amenable number.

18641945 is a deficient number, since it is larger than the sum of its proper divisors (10240615).

18641945 is a wasteful number, since it uses less digits than its factorization.

18641945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 145 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 18641945 is about 4317.6318740717. The cubic root of 18641945 is about 265.1533229268.

The spelling of 18641945 in words is "eighteen million, six hundred forty-one thousand, nine hundred forty-five".