378138197 has 2 divisors, whose sum is σ = 378138198. Its totient is φ = 378138196.

The previous prime is 378138179. The next prime is 378138223. The reversal of 378138197 is 791831873.

Together with previous prime (378138179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275095396 + 103042801 = 16586^2 + 10151^2 .

It is a cyclic number.

It is not a de Polignac number, because 378138197 - 2¹⁴ = 378121813 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 (378138997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189069098 + 189069099.

It is an arithmetic number, because the mean of its divisors is an integer number (189069099).

Almost surely, 2^378138197 is an apocalyptic number.

It is an amenable number.

378138197 is a deficient number, since it is larger than the sum of its proper divisors (1).

378138197 is an equidigital number, since it uses as much as digits as its factorization.

378138197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 378138197 is about 19445.7758137854. The cubic root of 378138197 is about 723.1307834452.

The spelling of 378138197 in words is "three hundred seventy-eight million, one hundred thirty-eight thousand, one hundred ninety-seven".