1386765 has 12 divisors (see below), whose sum is σ = 2403804. Its totient is φ = 739584.

The previous prime is 1386757. The next prime is 1386767. The reversal of 1386765 is 5676831.

It can be written as a sum of positive squares in 2 ways, for example, as 233289 + 1153476 = 483^2 + 1074^2 .

It is not a de Polignac number, because 1386765 - 2³ = 1386757 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15364 + ... + 15453.

It is an arithmetic number, because the mean of its divisors is an integer number (200317).

2^1386765 is an apocalyptic number.

1386765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1386765 is a deficient number, since it is larger than the sum of its proper divisors (1017039).

1386765 is a wasteful number, since it uses less digits than its factorization.

1386765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30828 (or 30825 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1386765 is about 1177.6098674858. The cubic root of 1386765 is about 111.5152572846.

It can be divided in two parts, 138 and 6765, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 1386765 in words is "one million, three hundred eighty-six thousand, seven hundred sixty-five".