18972673 has 4 divisors (see below), whose sum is σ = 18984240. Its totient is φ = 18961108.

The previous prime is 18972661. The next prime is 18972727. The reversal of 18972673 is 37627981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37627981 = 2153 ⋅17477.

It is a cyclic number.

It is not a de Polignac number, because 18972673 - 2¹³ = 18964481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18972623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2815 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (4746060).

It is a Proth number, since it is equal to 579 ⋅ 2¹⁵ + 1 and 579 < 2¹⁵.

Almost surely, 2^18972673 is an apocalyptic number.

It is an amenable number.

18972673 is a deficient number, since it is larger than the sum of its proper divisors (11567).

18972673 is an equidigital number, since it uses as much as digits as its factorization.

18972673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11566.

The product of its digits is 127008, while the sum is 43.

The square root of 18972673 is about 4355.7631937469. The cubic root of 18972673 is about 266.7121746987.

The spelling of 18972673 in words is "eighteen million, nine hundred seventy-two thousand, six hundred seventy-three".