1245391 has 4 divisors (see below), whose sum is σ = 1423312. Its totient is φ = 1067472.

The previous prime is 1245379. The next prime is 1245397. The reversal of 1245391 is 1935421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1935421 = 79 ⋅24499.

It is not a de Polignac number, because 1245391 - 2⁹ = 1244879 is a prime.

It is a Duffinian number.

1245391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88950 + ... + 88963.

It is an arithmetic number, because the mean of its divisors is an integer number (355828).

2^1245391 is an apocalyptic number.

1245391 is a deficient number, since it is larger than the sum of its proper divisors (177921).

1245391 is an equidigital number, since it uses as much as digits as its factorization.

1245391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177920.

The product of its digits is 1080, while the sum is 25.

The square root of 1245391 is about 1115.9708777562. The cubic root of 1245391 is about 107.5891742493.

It can be divided in two parts, 12453 and 91, that added together give a square (12544 = 112²).

The spelling of 1245391 in words is "one million, two hundred forty-five thousand, three hundred ninety-one".