1378019449 has 2 divisors, whose sum is σ = 1378019450. Its totient is φ = 1378019448.

The previous prime is 1378019429. The next prime is 1378019501. The reversal of 1378019449 is 9449108731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1201315600 + 176703849 = 34660^2 + 13293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378019449 - 2⁵ = 1378019417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1378019399 and 1378019408.

It is not a weakly prime, because it can be changed into another prime (1378019429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689009724 + 689009725.

It is an arithmetic number, because the mean of its divisors is an integer number (689009725).

Almost surely, 2^1378019449 is an apocalyptic number.

It is an amenable number.

1378019449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378019449 is an equidigital number, since it uses as much as digits as its factorization.

1378019449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1378019449 is about 37121.6843502554. The cubic root of 1378019449 is about 1112.8034131646.

The spelling of 1378019449 in words is "one billion, three hundred seventy-eight million, nineteen thousand, four hundred forty-nine".