19528973 has 4 divisors (see below), whose sum is σ = 19541148. Its totient is φ = 19516800.

The previous prime is 19528931. The next prime is 19528991. The reversal of 19528973 is 37982591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2866249 + 16662724 = 1693^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 19528973 - 2¹⁴ = 19512589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19528073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3236 + ... + 7037.

It is an arithmetic number, because the mean of its divisors is an integer number (4885287).

Almost surely, 2^19528973 is an apocalyptic number.

It is an amenable number.

19528973 is a deficient number, since it is larger than the sum of its proper divisors (12175).

19528973 is a wasteful number, since it uses less digits than its factorization.

19528973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12174.

The product of its digits is 136080, while the sum is 44.

The square root of 19528973 is about 4419.1597617647. The cubic root of 19528973 is about 269.2938704653.

The spelling of 19528973 in words is "nineteen million, five hundred twenty-eight thousand, nine hundred seventy-three".