18443946 has 64 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 5287680.

The previous prime is 18443933. The next prime is 18443951. The reversal of 18443946 is 64934481.

It is a happy number.

18443946 is nontrivially palindromic in base 5.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 59925 + ... + 60231.

It is an arithmetic number, because the mean of its divisors is an integer number (665280).

Almost surely, 2^18443946 is an apocalyptic number.

18443946 is an abundant number, since it is smaller than the sum of its proper divisors (24133974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18443946 is a wasteful number, since it uses less digits than its factorization.

18443946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its digits is 82944, while the sum is 39.

The square root of 18443946 is about 4294.6415449953. The cubic root of 18443946 is about 264.2112347502.

The spelling of 18443946 in words is "eighteen million, four hundred forty-three thousand, nine hundred forty-six".