1377986771 has 12 divisors (see below), whose sum is σ = 1607215320. Its totient is φ = 1177999200.

The previous prime is 1377986759. The next prime is 1377986777. The reversal of 1377986771 is 1776897731.

It is not a de Polignac number, because 1377986771 - 2¹⁰ = 1377985747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1377986777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18530 + ... + 55671.

It is an arithmetic number, because the mean of its divisors is an integer number (133934610).

Almost surely, 2^1377986771 is an apocalyptic number.

1377986771 is a deficient number, since it is larger than the sum of its proper divisors (229228549).

1377986771 is an equidigital number, since it uses as much as digits as its factorization.

1377986771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74594 (or 74587 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 56.

The square root of 1377986771 is about 37121.2442005922. The cubic root of 1377986771 is about 1112.7946168501.

The spelling of 1377986771 in words is "one billion, three hundred seventy-seven million, nine hundred eighty-six thousand, seven hundred seventy-one".