378987839 has 2 divisors, whose sum is σ = 378987840. Its totient is φ = 378987838.

The previous prime is 378987793. The next prime is 378987871. The reversal of 378987839 is 938789873.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 378987839 - 2²⁸ = 110552383 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 (378984839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189493919 + 189493920.

It is an arithmetic number, because the mean of its divisors is an integer number (189493920).

Almost surely, 2^378987839 is an apocalyptic number.

378987839 is a deficient number, since it is larger than the sum of its proper divisors (1).

378987839 is an equidigital number, since it uses as much as digits as its factorization.

378987839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 62.

The square root of 378987839 is about 19467.6099971209. The cubic root of 378987839 is about 723.6719812532.

The spelling of 378987839 in words is "three hundred seventy-eight million, nine hundred eighty-seven thousand, eight hundred thirty-nine".