1243000 has 64 divisors (see below), whose sum is σ = 3201120. Its totient is φ = 448000.

The previous prime is 1242991. The next prime is 1243003. The reversal of 1243000 is 3421.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10944 + ... + 11056.

2^1243000 is an apocalyptic number.

1243000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1600560).

1243000 is an abundant number, since it is smaller than the sum of its proper divisors (1958120).

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

1243000 is a wasteful number, since it uses less digits than its factorization.

1243000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 1243000 is about 1114.8990985735. The cubic root of 1243000 is about 107.5202774080.

Adding to 1243000 its reverse (3421), we get a palindrome (1246421).

The spelling of 1243000 in words is "one million, two hundred forty-three thousand".