1243818 has 24 divisors (see below), whose sum is σ = 2759328. Its totient is φ = 404712.

The previous prime is 1243811. The next prime is 1243819. The reversal of 1243818 is 8183421.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243791 and 1243800.

It is not an unprimeable number, because it can be changed into a prime (1243811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30 + ... + 1577.

It is an arithmetic number, because the mean of its divisors is an integer number (114972).

2^1243818 is an apocalyptic number.

1243818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1243818 is an abundant number, since it is smaller than the sum of its proper divisors (1515510).

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

1243818 is a wasteful number, since it uses less digits than its factorization.

1243818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1655 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1243818 is about 1115.2658875802. The cubic root of 1243818 is about 107.5438580733.

The spelling of 1243818 in words is "one million, two hundred forty-three thousand, eight hundred eighteen".