378531397 has 2 divisors, whose sum is σ = 378531398. Its totient is φ = 378531396.

The previous prime is 378531389. The next prime is 378531409. The reversal of 378531397 is 793135873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361342081 + 17189316 = 19009^2 + 4146^2 .

It is an emirp because it is prime and its reverse (793135873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378531397 - 2³ = 378531389 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 (378531337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189265698 + 189265699.

It is an arithmetic number, because the mean of its divisors is an integer number (189265699).

Almost surely, 2^378531397 is an apocalyptic number.

It is an amenable number.

378531397 is a deficient number, since it is larger than the sum of its proper divisors (1).

378531397 is an equidigital number, since it uses as much as digits as its factorization.

378531397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 46.

The square root of 378531397 is about 19455.8833518296. The cubic root of 378531397 is about 723.3813413362.

The spelling of 378531397 in words is "three hundred seventy-eight million, five hundred thirty-one thousand, three hundred ninety-seven".