1378957819 has 2 divisors, whose sum is σ = 1378957820. Its totient is φ = 1378957818.

The previous prime is 1378957817. The next prime is 1378957837. The reversal of 1378957819 is 9187598731.

It is a weak prime.

It is an emirp because it is prime and its reverse (9187598731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378957819 - 2¹ = 1378957817 is a prime.

It is a super-2 number, since 2×1378957819² = 3803049333162473522, which contains 22 as substring.

Together with 1378957817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1378957817) 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, 689478909 + 689478910.

It is an arithmetic number, because the mean of its divisors is an integer number (689478910).

Almost surely, 2^1378957819 is an apocalyptic number.

1378957819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378957819 is an equidigital number, since it uses as much as digits as its factorization.

1378957819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 58.

The square root of 1378957819 is about 37134.3213079221. The cubic root of 1378957819 is about 1113.0559457410.

The spelling of 1378957819 in words is "one billion, three hundred seventy-eight million, nine hundred fifty-seven thousand, eight hundred nineteen".