1377457729 has 2 divisors, whose sum is σ = 1377457730. Its totient is φ = 1377457728.

The previous prime is 1377457709. The next prime is 1377457769. The reversal of 1377457729 is 9277547731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1072431504 + 305026225 = 32748^2 + 17465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377457729 - 2⁹ = 1377457217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377457709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688728864 + 688728865.

It is an arithmetic number, because the mean of its divisors is an integer number (688728865).

Almost surely, 2^1377457729 is an apocalyptic number.

It is an amenable number.

1377457729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377457729 is an equidigital number, since it uses as much as digits as its factorization.

1377457729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2593080, while the sum is 52.

The square root of 1377457729 is about 37114.1176508347. The cubic root of 1377457729 is about 1112.6521891532.

The spelling of 1377457729 in words is "one billion, three hundred seventy-seven million, four hundred fifty-seven thousand, seven hundred twenty-nine".