18296921 has 2 divisors, whose sum is σ = 18296922. Its totient is φ = 18296920.

The previous prime is 18296897. The next prime is 18296933. The reversal of 18296921 is 12969281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 698896 = 4195^2 + 836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18296921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18296951) 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 as a sum of consecutive naturals, namely, 9148460 + 9148461.

It is an arithmetic number, because the mean of its divisors is an integer number (9148461).

Almost surely, 2^18296921 is an apocalyptic number.

It is an amenable number.

18296921 is a deficient number, since it is larger than the sum of its proper divisors (1).

18296921 is an equidigital number, since it uses as much as digits as its factorization.

18296921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 18296921 is about 4277.4900350556. The cubic root of 18296921 is about 263.5073120811.

The spelling of 18296921 in words is "eighteen million, two hundred ninety-six thousand, nine hundred twenty-one".