18872533 has 8 divisors (see below), whose sum is σ = 20672280. Its totient is φ = 17149440.

The previous prime is 18872527. The next prime is 18872537. The reversal of 18872533 is 33527881.

It can be written as a sum of positive squares in 4 ways, for example, as 10903204 + 7969329 = 3302^2 + 2823^2 .

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

It is not a de Polignac number, because 18872533 - 2⁵ = 18872501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18872492 and 18872501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18648 + ... + 19633.

It is an arithmetic number, because the mean of its divisors is an integer number (2584035).

Almost surely, 2^18872533 is an apocalyptic number.

It is an amenable number.

18872533 is a deficient number, since it is larger than the sum of its proper divisors (1799747).

18872533 is a wasteful number, since it uses less digits than its factorization.

18872533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38327.

The product of its digits is 40320, while the sum is 37.

The square root of 18872533 is about 4344.2528701723. The cubic root of 18872533 is about 266.2421006128.

The spelling of 18872533 in words is "eighteen million, eight hundred seventy-two thousand, five hundred thirty-three".