18890953 has 2 divisors, whose sum is σ = 18890954. Its totient is φ = 18890952.

The previous prime is 18890947. The next prime is 18890969. The reversal of 18890953 is 35909881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12873744 + 6017209 = 3588^2 + 2453^2 .

It is a cyclic number.

It is not a de Polignac number, because 18890953 - 2⁹ = 18890441 is a prime.

It is not a weakly prime, because it can be changed into another prime (18890923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9445476 + 9445477.

It is an arithmetic number, because the mean of its divisors is an integer number (9445477).

Almost surely, 2^18890953 is an apocalyptic number.

It is an amenable number.

18890953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18890953 is an equidigital number, since it uses as much as digits as its factorization.

18890953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18890953 is about 4346.3723954581. The cubic root of 18890953 is about 266.3286917949.

The spelling of 18890953 in words is "eighteen million, eight hundred ninety thousand, nine hundred fifty-three".