1391045 has 4 divisors (see below), whose sum is σ = 1669260. Its totient is φ = 1112832.

The previous prime is 1391041. The next prime is 1391051. The reversal of 1391045 is 5401931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5401931 = 109 ⋅49559.

It can be written as a sum of positive squares in 2 ways, for example, as 376996 + 1014049 = 614^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391045 - 2² = 1391041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391041) 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, 139100 + ... + 139109.

It is an arithmetic number, because the mean of its divisors is an integer number (417315).

2^1391045 is an apocalyptic number.

It is an amenable number.

1391045 is a deficient number, since it is larger than the sum of its proper divisors (278215).

1391045 is an equidigital number, since it uses as much as digits as its factorization.

1391045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278214.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1391045 is about 1179.4257077069. The cubic root of 1391045 is about 111.6298633698.

Adding to 1391045 its reverse (5401931), we get a palindrome (6792976).

The spelling of 1391045 in words is "one million, three hundred ninety-one thousand, forty-five".