1389811877 has 2 divisors, whose sum is σ = 1389811878. Its totient is φ = 1389811876.

The previous prime is 1389811799. The next prime is 1389811883. The reversal of 1389811877 is 7781189831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1342049956 + 47761921 = 36634^2 + 6911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389811877 - 2¹⁶ = 1389746341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389811177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694905938 + 694905939.

It is an arithmetic number, because the mean of its divisors is an integer number (694905939).

Almost surely, 2^1389811877 is an apocalyptic number.

It is an amenable number.

1389811877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389811877 is an equidigital number, since it uses as much as digits as its factorization.

1389811877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 53.

The square root of 1389811877 is about 37280.1807533172. The cubic root of 1389811877 is about 1115.9686802038.

The spelling of 1389811877 in words is "one billion, three hundred eighty-nine million, eight hundred eleven thousand, eight hundred seventy-seven".