1243103040 has 168 divisors, whose sum is σ = 4288782888. Its totient is φ = 330485760.

The previous prime is 1243102981. The next prime is 1243103041. The reversal of 1243103040 is 403013421.

It can be written as a sum of positive squares in 4 ways, for example, as 136609344 + 1106493696 = 11688^2 + 33264^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243103041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1880310 + ... + 1880970.

Almost surely, 2^1243103040 is an apocalyptic number.

1243103040 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 1243103040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2144391444).

1243103040 is an abundant number, since it is smaller than the sum of its proper divisors (3045679848).

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

1243103040 is a wasteful number, since it uses less digits than its factorization.

1243103040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1243103040 is about 35257.6664003731. Note that the first 3 decimals coincide. The cubic root of 1243103040 is about 1075.2324833405.

Adding to 1243103040 its reverse (403013421), we get a palindrome (1646116461).

The spelling of 1243103040 in words is "one billion, two hundred forty-three million, one hundred three thousand, forty".