1243397 has 4 divisors (see below), whose sum is σ = 1316556. Its totient is φ = 1170240.

The previous prime is 1243393. The next prime is 1243421. The reversal of 1243397 is 7933421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7933421 = 73 ⋅108677.

It can be written as a sum of positive squares in 2 ways, for example, as 1012036 + 231361 = 1006^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243397 - 2² = 1243393 is a prime.

It is a d-powerful number, because it can be written as 1 + 2⁷ + 4¹⁰ + 3⁶ + 3¹¹ + 9 + 7⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243391) 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, 36554 + ... + 36587.

It is an arithmetic number, because the mean of its divisors is an integer number (329139).

2^1243397 is an apocalyptic number.

1243397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1243397 is a deficient number, since it is larger than the sum of its proper divisors (73159).

1243397 is an equidigital number, since it uses as much as digits as its factorization.

1243397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73158.

The product of its digits is 4536, while the sum is 29.

The square root of 1243397 is about 1115.0771273773. The cubic root of 1243397 is about 107.5317231056.

The spelling of 1243397 in words is "one million, two hundred forty-three thousand, three hundred ninety-seven".