1377657389 has 2 divisors, whose sum is σ = 1377657390. Its totient is φ = 1377657388.

The previous prime is 1377657343. The next prime is 1377657397. The reversal of 1377657389 is 9837567731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1159947364 + 217710025 = 34058^2 + 14755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377657389 - 2⁸ = 1377657133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377657319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688828694 + 688828695.

It is an arithmetic number, because the mean of its divisors is an integer number (688828695).

Almost surely, 2^1377657389 is an apocalyptic number.

It is an amenable number.

1377657389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377657389 is an equidigital number, since it uses as much as digits as its factorization.

1377657389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6667920, while the sum is 56.

The square root of 1377657389 is about 37116.8073653971. The cubic root of 1377657389 is about 1112.7059455284.

The spelling of 1377657389 in words is "one billion, three hundred seventy-seven million, six hundred fifty-seven thousand, three hundred eighty-nine".