1378044557 has 2 divisors, whose sum is σ = 1378044558. Its totient is φ = 1378044556.

The previous prime is 1378044541. The next prime is 1378044571. The reversal of 1378044557 is 7554408731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115960836 + 262083721 = 33406^2 + 16189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378044557 - 2⁴ = 1378044541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378044527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689022278 + 689022279.

It is an arithmetic number, because the mean of its divisors is an integer number (689022279).

Almost surely, 2^1378044557 is an apocalyptic number.

It is an amenable number.

1378044557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378044557 is an equidigital number, since it uses as much as digits as its factorization.

1378044557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 44.

The square root of 1378044557 is about 37122.0225338006. The cubic root of 1378044557 is about 1112.8101716803.

The spelling of 1378044557 in words is "one billion, three hundred seventy-eight million, forty-four thousand, five hundred fifty-seven".