1243648 has 40 divisors (see below), whose sum is σ = 2848032. Its totient is φ = 531456.

The previous prime is 1243643. The next prime is 1243663. The reversal of 1243648 is 8463421.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1243643) 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, 3411 + ... + 3757.

2^1243648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424016).

1243648 is an abundant number, since it is smaller than the sum of its proper divisors (1604384).

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

1243648 is an frugal number, since it uses more digits than its factorization.

1243648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 356 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 1243648 is about 1115.1896699665. The cubic root of 1243648 is about 107.5389582972.

It can be divided in two parts, 1243 and 648, that added together give a triangular number (1891 = T₆₁).

The spelling of 1243648 in words is "one million, two hundred forty-three thousand, six hundred forty-eight".