1243457 has 4 divisors (see below), whose sum is σ = 1253376. Its totient is φ = 1233540.

The previous prime is 1243439. The next prime is 1243471. The reversal of 1243457 is 7543421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7543421 = 223 ⋅33827.

It is a cyclic number.

It is not a de Polignac number, because 1243457 - 2⁶ = 1243393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243427) 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, 4769 + ... + 5022.

It is an arithmetic number, because the mean of its divisors is an integer number (313344).

2^1243457 is an apocalyptic number.

It is an amenable number.

1243457 is a deficient number, since it is larger than the sum of its proper divisors (9919).

1243457 is an equidigital number, since it uses as much as digits as its factorization.

1243457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9918.

The product of its digits is 3360, while the sum is 26.

The square root of 1243457 is about 1115.1040310213. The cubic root of 1243457 is about 107.5334527221.

Adding to 1243457 its reverse (7543421), we get a palindrome (8786878).

The spelling of 1243457 in words is "one million, two hundred forty-three thousand, four hundred fifty-seven".