1380366765 has 80 divisors (see below), whose sum is σ = 2638742832. Its totient is φ = 687937536.

The previous prime is 1380366761. The next prime is 1380366769. The reversal of 1380366765 is 5676630831.

It is an interprime number because it is at equal distance from previous prime (1380366761) and next prime (1380366769).

It can be written as a sum of positive squares in 8 ways, for example, as 3437316 + 1376929449 = 1854^2 + 37107^2 .

It is not a de Polignac number, because 1380366765 - 2² = 1380366761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1380366765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380366761) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1080307 + ... + 1081583.

Almost surely, 2^1380366765 is an apocalyptic number.

1380366765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1380366765 is a deficient number, since it is larger than the sum of its proper divisors (1258376067).

1380366765 is a wasteful number, since it uses less digits than its factorization.

1380366765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 1380366765 is about 37153.2874050198. The cubic root of 1380366765 is about 1113.4349038910.

The spelling of 1380366765 in words is "one billion, three hundred eighty million, three hundred sixty-six thousand, seven hundred sixty-five".