18905973 has 8 divisors (see below), whose sum is σ = 25230048. Its totient is φ = 12592944.

The previous prime is 18905963. The next prime is 18906031. The reversal of 18905973 is 37950981.

It is a happy number.

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

It is not a de Polignac number, because 18905973 - 2¹² = 18901877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18905923) 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 7 ways as a sum of consecutive naturals, for example, 2886 + ... + 6792.

It is an arithmetic number, because the mean of its divisors is an integer number (3153756).

Almost surely, 2^18905973 is an apocalyptic number.

It is an amenable number.

18905973 is a deficient number, since it is larger than the sum of its proper divisors (6324075).

18905973 is a wasteful number, since it uses less digits than its factorization.

18905973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5523.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 18905973 is about 4348.0999298544. The cubic root of 18905973 is about 266.3992581525.

The spelling of 18905973 in words is "eighteen million, nine hundred five thousand, nine hundred seventy-three".