1378836457 has 2 divisors, whose sum is σ = 1378836458. Its totient is φ = 1378836456.

The previous prime is 1378836451. The next prime is 1378836491. The reversal of 1378836457 is 7546388731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981192976 + 397643481 = 31324^2 + 19941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378836457 - 2²⁷ = 1244618729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378836451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689418228 + 689418229.

It is an arithmetic number, because the mean of its divisors is an integer number (689418229).

Almost surely, 2^1378836457 is an apocalyptic number.

It is an amenable number.

1378836457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378836457 is an equidigital number, since it uses as much as digits as its factorization.

1378836457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 52.

The square root of 1378836457 is about 37132.6871772028. The cubic root of 1378836457 is about 1113.0232914527.

The spelling of 1378836457 in words is "one billion, three hundred seventy-eight million, eight hundred thirty-six thousand, four hundred fifty-seven".