19924397 has 2 divisors, whose sum is σ = 19924398. Its totient is φ = 19924396.

The previous prime is 19924367. The next prime is 19924433. The reversal of 19924397 is 79342991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 1485961 = 4294^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 19924397 - 2¹⁰ = 19923373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19924327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9962198 + 9962199.

It is an arithmetic number, because the mean of its divisors is an integer number (9962199).

Almost surely, 2^19924397 is an apocalyptic number.

It is an amenable number.

19924397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19924397 is an equidigital number, since it uses as much as digits as its factorization.

19924397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 19924397 is about 4463.6752794082. The cubic root of 19924397 is about 271.0992995852.

The spelling of 19924397 in words is "nineteen million, nine hundred twenty-four thousand, three hundred ninety-seven".