18695213 has 2 divisors, whose sum is σ = 18695214. Its totient is φ = 18695212.

The previous prime is 18695207. The next prime is 18695269. The reversal of 18695213 is 31259681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17952169 + 743044 = 4237^2 + 862^2 .

It is a cyclic number.

It is not a de Polignac number, because 18695213 - 2⁸ = 18694957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18695203) 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, 9347606 + 9347607.

It is an arithmetic number, because the mean of its divisors is an integer number (9347607).

Almost surely, 2^18695213 is an apocalyptic number.

It is an amenable number.

18695213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18695213 is an equidigital number, since it uses as much as digits as its factorization.

18695213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 18695213 is about 4323.7961330294. The cubic root of 18695213 is about 265.4056348605.

The spelling of 18695213 in words is "eighteen million, six hundred ninety-five thousand, two hundred thirteen".