1386505 has 4 divisors (see below), whose sum is σ = 1663812. Its totient is φ = 1109200.

The previous prime is 1386499. The next prime is 1386551. The reversal of 1386505 is 5056831.

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 1054729 + 331776 = 1027^2 + 576^2 .

It is not a de Polignac number, because 1386505 - 2⁷ = 1386377 is a prime.

It is a super-2 number, since 2×1386505² = 3844792230050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138646 + ... + 138655.

It is an arithmetic number, because the mean of its divisors is an integer number (415953).

2^1386505 is an apocalyptic number.

It is an amenable number.

1386505 is a deficient number, since it is larger than the sum of its proper divisors (277307).

1386505 is an equidigital number, since it uses as much as digits as its factorization.

1386505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277306.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1386505 is about 1177.4994692143. The cubic root of 1386505 is about 111.5082876397.

It can be divided in two parts, 1386 and 505, that added together give a triangular number (1891 = T₆₁).

The spelling of 1386505 in words is "one million, three hundred eighty-six thousand, five hundred five".