1243020 has 24 divisors (see below), whose sum is σ = 3480624. Its totient is φ = 331456.

The previous prime is 1243013. The next prime is 1243093. The reversal of 1243020 is 203421.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1242987 and 1243005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10299 + ... + 10418.

It is an arithmetic number, because the mean of its divisors is an integer number (145026).

2^1243020 is an apocalyptic number.

1243020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243020 is an abundant number, since it is smaller than the sum of its proper divisors (2237604).

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

1243020 is a wasteful number, since it uses less digits than its factorization.

1243020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20729 (or 20727 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 1243020 is about 1114.9080679590. The cubic root of 1243020 is about 107.5208540757.

Adding to 1243020 its reverse (203421), we get a palindrome (1446441).

The spelling of 1243020 in words is "one million, two hundred forty-three thousand, twenty".