19394213 has 2 divisors, whose sum is σ = 19394214. Its totient is φ = 19394212.

The previous prime is 19394209. The next prime is 19394227. The reversal of 19394213 is 31249391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12623809 + 6770404 = 3553^2 + 2602^2 .

It is a cyclic number.

It is not a de Polignac number, because 19394213 - 2² = 19394209 is a prime.

It is a super-2 number, since 2×19394213² = 752270995778738, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19394213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19394203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9697106 + 9697107.

It is an arithmetic number, because the mean of its divisors is an integer number (9697107).

Almost surely, 2^19394213 is an apocalyptic number.

It is an amenable number.

19394213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19394213 is an equidigital number, since it uses as much as digits as its factorization.

19394213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 19394213 is about 4403.8861247766. The cubic root of 19394213 is about 268.6730179366.

The spelling of 19394213 in words is "nineteen million, three hundred ninety-four thousand, two hundred thirteen".