1377538765 has 4 divisors (see below), whose sum is σ = 1653046524. Its totient is φ = 1102031008.

The previous prime is 1377538763. The next prime is 1377538777. The reversal of 1377538765 is 5678357731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 364580836 + 1012957929 = 19094^2 + 31827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377538765 - 2¹ = 1377538763 is a prime.

It is a super-2 number, since 2×1377538765² = 3795226098155450450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377538763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137753872 + ... + 137753881.

It is an arithmetic number, because the mean of its divisors is an integer number (413261631).

Almost surely, 2^1377538765 is an apocalyptic number.

It is an amenable number.

1377538765 is a deficient number, since it is larger than the sum of its proper divisors (275507759).

1377538765 is an equidigital number, since it uses as much as digits as its factorization.

1377538765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275507758.

The product of its digits is 3704400, while the sum is 52.

The square root of 1377538765 is about 37115.2093487293. The cubic root of 1377538765 is about 1112.6740078783.

The spelling of 1377538765 in words is "one billion, three hundred seventy-seven million, five hundred thirty-eight thousand, seven hundred sixty-five".