18870973 has 8 divisors (see below), whose sum is σ = 20936160. Its totient is φ = 16864080.

The previous prime is 18870959. The next prime is 18870997. The reversal of 18870973 is 37907881.

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

It is a cyclic number.

It is not a de Polignac number, because 18870973 - 2¹⁷ = 18739901 is a prime.

It is a super-2 number, since 2×18870973² = 712227243933458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13890 + ... + 15187.

It is an arithmetic number, because the mean of its divisors is an integer number (2617020).

Almost surely, 2^18870973 is an apocalyptic number.

It is an amenable number.

18870973 is a deficient number, since it is larger than the sum of its proper divisors (2065187).

18870973 is a wasteful number, since it uses less digits than its factorization.

18870973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29147.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 18870973 is about 4344.0733189024. The cubic root of 18870973 is about 266.2347645701.

The spelling of 18870973 in words is "eighteen million, eight hundred seventy thousand, nine hundred seventy-three".