1243403140 has 48 divisors (see below), whose sum is σ = 2995034112. Its totient is φ = 424757376.

The previous prime is 1243403131. The next prime is 1243403141. The reversal of 1243403140 is 413043421.

It is not an unprimeable number, because it can be changed into a prime (1243403141) 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, 22749 + ... + 54811.

It is an arithmetic number, because the mean of its divisors is an integer number (62396544).

Almost surely, 2^1243403140 is an apocalyptic number.

1243403140 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 1243403140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497517056).

1243403140 is an abundant number, since it is smaller than the sum of its proper divisors (1751630972).

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

1243403140 is a wasteful number, since it uses less digits than its factorization.

1243403140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32356 (or 32354 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1243403140 is about 35261.9219555599. The cubic root of 1243403140 is about 1075.3190010560.

Adding to 1243403140 its reverse (413043421), we get a palindrome (1656446561).

The spelling of 1243403140 in words is "one billion, two hundred forty-three million, four hundred three thousand, one hundred forty".