1386809 has 12 divisors (see below), whose sum is σ = 1536444. Its totient is φ = 1247232.

The previous prime is 1386787. The next prime is 1386811. The reversal of 1386809 is 9086831.

It can be written as a sum of positive squares in 6 ways, for example, as 29584 + 1357225 = 172^2 + 1165^2 .

It is not a de Polignac number, because 1386809 - 2¹⁶ = 1321273 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386839) 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, 14249 + ... + 14345.

It is an arithmetic number, because the mean of its divisors is an integer number (128037).

2^1386809 is an apocalyptic number.

It is an amenable number.

1386809 is a deficient number, since it is larger than the sum of its proper divisors (149635).

1386809 is an equidigital number, since it uses as much as digits as its factorization.

1386809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1386809 is about 1177.6285492463. The cubic root of 1386809 is about 111.5164366768.

The spelling of 1386809 in words is "one million, three hundred eighty-six thousand, eight hundred nine".