18961853 has 8 divisors (see below), whose sum is σ = 19687800. Its totient is φ = 18240768.

The previous prime is 18961847. The next prime is 18961879. The reversal of 18961853 is 35816981.

It can be written as a sum of positive squares in 4 ways, for example, as 1338649 + 17623204 = 1157^2 + 4198^2 .

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

It is not a de Polignac number, because 18961853 - 2¹⁴ = 18945469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18961853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961843) 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 7 ways as a sum of consecutive naturals, for example, 8033 + ... + 10121.

It is an arithmetic number, because the mean of its divisors is an integer number (2460975).

Almost surely, 2^18961853 is an apocalyptic number.

It is an amenable number.

18961853 is a deficient number, since it is larger than the sum of its proper divisors (725947).

18961853 is a wasteful number, since it uses less digits than its factorization.

18961853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its digits is 51840, while the sum is 41.

The square root of 18961853 is about 4354.5209839889. The cubic root of 18961853 is about 266.6614636138.

The spelling of 18961853 in words is "eighteen million, nine hundred sixty-one thousand, eight hundred fifty-three".