1379705 has 4 divisors (see below), whose sum is σ = 1655652. Its totient is φ = 1103760.

The previous prime is 1379699. The next prime is 1379753. The reversal of 1379705 is 5079731.

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 395641 + 984064 = 629^2 + 992^2 .

It is not a de Polignac number, because 1379705 - 2⁶ = 1379641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 137966 + ... + 137975.

It is an arithmetic number, because the mean of its divisors is an integer number (413913).

2^1379705 is an apocalyptic number.

It is an amenable number.

1379705 is a deficient number, since it is larger than the sum of its proper divisors (275947).

1379705 is an equidigital number, since it uses as much as digits as its factorization.

1379705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275946.

The product of its (nonzero) digits is 6615, while the sum is 32.

The square root of 1379705 is about 1174.6084453979. The cubic root of 1379705 is about 111.3256943934.

The spelling of 1379705 in words is "one million, three hundred seventy-nine thousand, seven hundred five".