1380516777 has 14 divisors (see below), whose sum is σ = 2069829402. Its totient is φ = 920344032.

The previous prime is 1380516749. The next prime is 1380516779. The reversal of 1380516777 is 7776150831.

It can be written as a sum of positive squares in only one way, i.e., 1256773401 + 123743376 = 35451^2 + 11124^2 .

It is not a de Polignac number, because 1380516777 - 2¹⁴ = 1380500393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1380516779) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 946128 + ... + 947585.

Almost surely, 2^1380516777 is an apocalyptic number.

It is an amenable number.

1380516777 is a deficient number, since it is larger than the sum of its proper divisors (689312625).

1380516777 is an frugal number, since it uses more digits than its factorization.

1380516777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893731 (or 1893716 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 1380516777 is about 37155.3061755653. The cubic root of 1380516777 is about 1113.4752367820.

The spelling of 1380516777 in words is "one billion, three hundred eighty million, five hundred sixteen thousand, seven hundred seventy-seven".