394172297 has 2 divisors, whose sum is σ = 394172298. Its totient is φ = 394172296.

The previous prime is 394172281. The next prime is 394172299. The reversal of 394172297 is 792271493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334743616 + 59428681 = 18296^2 + 7709^2 .

It is a cyclic number.

It is not a de Polignac number, because 394172297 - 2⁴ = 394172281 is a prime.

Together with 394172299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394172299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197086148 + 197086149.

It is an arithmetic number, because the mean of its divisors is an integer number (197086149).

Almost surely, 2^394172297 is an apocalyptic number.

It is an amenable number.

394172297 is a deficient number, since it is larger than the sum of its proper divisors (1).

394172297 is an equidigital number, since it uses as much as digits as its factorization.

394172297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 394172297 is about 19853.7728656293. The cubic root of 394172297 is about 733.2105400231.

It can be divided in two parts, 39417 and 2297, that added together give a palindrome (41714).

The spelling of 394172297 in words is "three hundred ninety-four million, one hundred seventy-two thousand, two hundred ninety-seven".