1391005 has 16 divisors (see below), whose sum is σ = 2081664. Its totient is φ = 866880.

The previous prime is 1390993. The next prime is 1391011. The reversal of 1391005 is 5001931.

It is not a de Polignac number, because 1391005 - 2¹⁹ = 866717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422 + ... + 2191.

It is an arithmetic number, because the mean of its divisors is an integer number (130104).

2^1391005 is an apocalyptic number.

It is an amenable number.

1391005 is a deficient number, since it is larger than the sum of its proper divisors (690659).

1391005 is a wasteful number, since it uses less digits than its factorization.

1391005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 1391005 is about 1179.4087501795. The cubic root of 1391005 is about 111.6287933739.

Adding to 1391005 its reverse (5001931), we get a palindrome (6392936).

The spelling of 1391005 in words is "one million, three hundred ninety-one thousand, five".