378991339 has 2 divisors, whose sum is σ = 378991340. Its totient is φ = 378991338.

The previous prime is 378991307. The next prime is 378991351. The reversal of 378991339 is 933199873.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 378991339 - 2⁵ = 378991307 is a prime.

It is not a weakly prime, because it can be changed into another prime (378991939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189495669 + 189495670.

It is an arithmetic number, because the mean of its divisors is an integer number (189495670).

Almost surely, 2^378991339 is an apocalyptic number.

378991339 is a deficient number, since it is larger than the sum of its proper divisors (1).

378991339 is an equidigital number, since it uses as much as digits as its factorization.

378991339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 52.

The square root of 378991339 is about 19467.6998898175. The cubic root of 378991339 is about 723.6742089800.

The spelling of 378991339 in words is "three hundred seventy-eight million, nine hundred ninety-one thousand, three hundred thirty-nine".