18972497 has 4 divisors (see below), whose sum is σ = 19156800. Its totient is φ = 18788196.

The previous prime is 18972451. The next prime is 18972517. The reversal of 18972497 is 79427981.

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 an emirpimes, since its reverse is a distinct semiprime: 79427981 = 227 ⋅349903.

It is a cyclic number.

It is not a de Polignac number, because 18972497 - 2¹⁶ = 18906961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18972097) 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 3 ways as a sum of consecutive naturals, for example, 91997 + ... + 92202.

It is an arithmetic number, because the mean of its divisors is an integer number (4789200).

Almost surely, 2^18972497 is an apocalyptic number.

It is an amenable number.

18972497 is a deficient number, since it is larger than the sum of its proper divisors (184303).

18972497 is a wasteful number, since it uses less digits than its factorization.

18972497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184302.

The product of its digits is 254016, while the sum is 47.

The square root of 18972497 is about 4355.7429905815. The cubic root of 18972497 is about 266.7113499776.

The spelling of 18972497 in words is "eighteen million, nine hundred seventy-two thousand, four hundred ninety-seven".