18005961 has 8 divisors (see below), whose sum is σ = 24337120. Its totient is φ = 11839392.

The previous prime is 18005959. The next prime is 18005963. The reversal of 18005961 is 16950081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18005959) and next prime (18005963).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18005961 - 2¹ = 18005959 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18005963) 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, 40891 + ... + 41328.

It is an arithmetic number, because the mean of its divisors is an integer number (3042140).

Almost surely, 2^18005961 is an apocalyptic number.

It is an amenable number.

18005961 is a deficient number, since it is larger than the sum of its proper divisors (6331159).

18005961 is an equidigital number, since it uses as much as digits as its factorization.

18005961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82295.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18005961 is about 4243.3431395540. The cubic root of 18005961 is about 262.1030663010.

The spelling of 18005961 in words is "eighteen million, five thousand, nine hundred sixty-one".