1378901749 has 2 divisors, whose sum is σ = 1378901750. Its totient is φ = 1378901748.

The previous prime is 1378901743. The next prime is 1378901827. The reversal of 1378901749 is 9471098731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912644100 + 466257649 = 30210^2 + 21593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378901749 - 2⁵ = 1378901717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378901743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689450874 + 689450875.

It is an arithmetic number, because the mean of its divisors is an integer number (689450875).

Almost surely, 2^1378901749 is an apocalyptic number.

It is an amenable number.

1378901749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378901749 is an equidigital number, since it uses as much as digits as its factorization.

1378901749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 1378901749 is about 37133.5663382875. The cubic root of 1378901749 is about 1113.0408594945.

The spelling of 1378901749 in words is "one billion, three hundred seventy-eight million, nine hundred one thousand, seven hundred forty-nine".