1243428 has 12 divisors (see below), whose sum is σ = 2901360. Its totient is φ = 414472.

The previous prime is 1243427. The next prime is 1243439. The reversal of 1243428 is 8243421.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1243428² = 3092226382368, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1243398 and 1243407.

It is not an unprimeable number, because it can be changed into a prime (1243421) 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, 51798 + ... + 51821.

It is an arithmetic number, because the mean of its divisors is an integer number (241780).

2^1243428 is an apocalyptic number.

It is an amenable number.

1243428 is an abundant number, since it is smaller than the sum of its proper divisors (1657932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243428 is a wasteful number, since it uses less digits than its factorization.

1243428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103626 (or 103624 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 1243428 is about 1115.0910276744. The cubic root of 1243428 is about 107.5326167477.

Adding to 1243428 its reverse (8243421), we get a palindrome (9486849).

The spelling of 1243428 in words is "one million, two hundred forty-three thousand, four hundred twenty-eight".