19216397 has 2 divisors, whose sum is σ = 19216398. Its totient is φ = 19216396.

The previous prime is 19216367. The next prime is 19216423. The reversal of 19216397 is 79361291.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18957316 + 259081 = 4354^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 19216397 - 2¹² = 19212301 is a prime.

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 19216397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19216367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9608198 + 9608199.

It is an arithmetic number, because the mean of its divisors is an integer number (9608199).

Almost surely, 2^19216397 is an apocalyptic number.

It is an amenable number.

19216397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19216397 is an equidigital number, since it uses as much as digits as its factorization.

19216397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 19216397 is about 4383.6511038175. The cubic root of 19216397 is about 267.8493853719.

The spelling of 19216397 in words is "nineteen million, two hundred sixteen thousand, three hundred ninety-seven".