1386739 has 4 divisors (see below), whose sum is σ = 1447056. Its totient is φ = 1326424.

The previous prime is 1386733. The next prime is 1386757. The reversal of 1386739 is 9376831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9376831 = 29 ⋅323339.

It is a cyclic number.

It is not a de Polignac number, because 1386739 - 2³ = 1386731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1386698 and 1386707.

It is not an unprimeable number, because it can be changed into a prime (1386731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30124 + ... + 30169.

It is an arithmetic number, because the mean of its divisors is an integer number (361764).

2^1386739 is an apocalyptic number.

1386739 is a deficient number, since it is larger than the sum of its proper divisors (60317).

1386739 is an equidigital number, since it uses as much as digits as its factorization.

1386739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60316.

The product of its digits is 27216, while the sum is 37.

The square root of 1386739 is about 1177.5988281244. The cubic root of 1386739 is about 111.5145603593.

The spelling of 1386739 in words is "one million, three hundred eighty-six thousand, seven hundred thirty-nine".