1243220 has 24 divisors (see below), whose sum is σ = 2848608. Its totient is φ = 452000.

The previous prime is 1243211. The next prime is 1243271. The reversal of 1243220 is 223421.

It is a junction number, because it is equal to n+sod(n) for n = 1243195 and 1243204.

It is a congruent number.

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, 2606 + ... + 3045.

It is an arithmetic number, because the mean of its divisors is an integer number (118692).

2^1243220 is an apocalyptic number.

1243220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243220 is an abundant number, since it is smaller than the sum of its proper divisors (1605388).

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

1243220 is a wasteful number, since it uses less digits than its factorization.

1243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5671 (or 5669 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1243220 is about 1114.9977578453. The cubic root of 1243220 is about 107.5266204130.

Adding to 1243220 its reverse (223421), we get a palindrome (1466641).

The spelling of 1243220 in words is "one million, two hundred forty-three thousand, two hundred twenty".