1379905 has 4 divisors (see below), whose sum is σ = 1655892. Its totient is φ = 1103920.

The previous prime is 1379897. The next prime is 1379923. The reversal of 1379905 is 5099731.

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 788544 + 591361 = 888^2 + 769^2 .

It is not a de Polignac number, because 1379905 - 2³ = 1379897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137986 + ... + 137995.

It is an arithmetic number, because the mean of its divisors is an integer number (413973).

2^1379905 is an apocalyptic number.

It is an amenable number.

1379905 is a deficient number, since it is larger than the sum of its proper divisors (275987).

1379905 is an equidigital number, since it uses as much as digits as its factorization.

1379905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275986.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 1379905 is about 1174.6935770660. The cubic root of 1379905 is about 111.3310733363.

The spelling of 1379905 in words is "one million, three hundred seventy-nine thousand, nine hundred five".