18672541 has 2 divisors, whose sum is σ = 18672542. Its totient is φ = 18672540.

The previous prime is 18672517. The next prime is 18672551. The reversal of 18672541 is 14527681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14220441 + 4452100 = 3771^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18672541 - 2⁷ = 18672413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18672497 and 18672506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18672551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336270 + 9336271.

It is an arithmetic number, because the mean of its divisors is an integer number (9336271).

Almost surely, 2^18672541 is an apocalyptic number.

It is an amenable number.

18672541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18672541 is an equidigital number, since it uses as much as digits as its factorization.

18672541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 18672541 is about 4321.1735674467. The cubic root of 18672541 is about 265.2983041656.

It can be divided in two parts, 186 and 72541, that added together give a palindrome (72727).

The spelling of 18672541 in words is "eighteen million, six hundred seventy-two thousand, five hundred forty-one".