18869761 has 2 divisors, whose sum is σ = 18869762. Its totient is φ = 18869760.

The previous prime is 18869759. The next prime is 18869783. The reversal of 18869761 is 16796881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 5909761 = 3600^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 18869761 - 2¹ = 18869759 is a prime.

Together with 18869759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18869791) 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 as a sum of consecutive naturals, namely, 9434880 + 9434881.

It is an arithmetic number, because the mean of its divisors is an integer number (9434881).

Almost surely, 2^18869761 is an apocalyptic number.

It is an amenable number.

18869761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18869761 is an equidigital number, since it uses as much as digits as its factorization.

18869761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 18869761 is about 4343.9338162546. The cubic root of 18869761 is about 266.2290647502.

The spelling of 18869761 in words is "eighteen million, eight hundred sixty-nine thousand, seven hundred sixty-one".