199426397 has 2 divisors, whose sum is σ = 199426398. Its totient is φ = 199426396.

The previous prime is 199426373. The next prime is 199426429. The reversal of 199426397 is 793624991.

199426397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158030041 + 41396356 = 12571^2 + 6434^2 .

It is a cyclic number.

It is not a de Polignac number, because 199426397 - 2¹⁸ = 199164253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199426697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99713198 + 99713199.

It is an arithmetic number, because the mean of its divisors is an integer number (99713199).

Almost surely, 2^199426397 is an apocalyptic number.

It is an amenable number.

199426397 is a deficient number, since it is larger than the sum of its proper divisors (1).

199426397 is an equidigital number, since it uses as much as digits as its factorization.

199426397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 50.

The square root of 199426397 is about 14121.8411335066. The cubic root of 199426397 is about 584.2439371952.

The spelling of 199426397 in words is "one hundred ninety-nine million, four hundred twenty-six thousand, three hundred ninety-seven".