18722961 has 16 divisors (see below), whose sum is σ = 29198400. Its totient is φ = 11824704.

The previous prime is 18722947. The next prime is 18722981. The reversal of 18722961 is 16922781.

It is not a de Polignac number, because 18722961 - 2⁹ = 18722449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18722941) 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 15 ways as a sum of consecutive naturals, for example, 17736 + ... + 18761.

It is an arithmetic number, because the mean of its divisors is an integer number (1824900).

Almost surely, 2^18722961 is an apocalyptic number.

It is an amenable number.

18722961 is a deficient number, since it is larger than the sum of its proper divisors (10475439).

18722961 is a wasteful number, since it uses less digits than its factorization.

18722961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36525 (or 36519 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 18722961 is about 4327.0036977105. The cubic root of 18722961 is about 265.5368776379.

It can be divided in two parts, 18722 and 961, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18722961 in words is "eighteen million, seven hundred twenty-two thousand, nine hundred sixty-one".