18961841 has 8 divisors (see below), whose sum is σ = 19266984. Its totient is φ = 18659200.

The previous prime is 18961807. The next prime is 18961843. The reversal of 18961841 is 14816981.

It can be written as a sum of positive squares in 4 ways, for example, as 12816400 + 6145441 = 3580^2 + 2479^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18961841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18961795 and 18961804.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19421 + ... + 20373.

It is an arithmetic number, because the mean of its divisors is an integer number (2408373).

Almost surely, 2^18961841 is an apocalyptic number.

It is an amenable number.

18961841 is a deficient number, since it is larger than the sum of its proper divisors (305143).

18961841 is a wasteful number, since it uses less digits than its factorization.

18961841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251.

The product of its digits is 13824, while the sum is 38.

The square root of 18961841 is about 4354.5196061104. The cubic root of 18961841 is about 266.6614073616.

The spelling of 18961841 in words is "eighteen million, nine hundred sixty-one thousand, eight hundred forty-one".