1213123040 has 96 divisors (see below), whose sum is σ = 3033386496. Its totient is φ = 457515520.

The previous prime is 1213123027. The next prime is 1213123049. The reversal of 1213123040 is 403213121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213123049) 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, 258959 + ... + 263601.

It is an arithmetic number, because the mean of its divisors is an integer number (31597776).

Almost surely, 2^1213123040 is an apocalyptic number.

1213123040 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 1213123040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516693248).

1213123040 is an abundant number, since it is smaller than the sum of its proper divisors (1820263456).

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

1213123040 is a wasteful number, since it uses less digits than its factorization.

1213123040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4752 (or 4744 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1213123040 is about 34829.9158770158. The cubic root of 1213123040 is about 1066.5182310810.

Adding to 1213123040 its reverse (403213121), we get a palindrome (1616336161).

The spelling of 1213123040 in words is "one billion, two hundred thirteen million, one hundred twenty-three thousand, forty".