1213231040 has 112 divisors (see below), whose sum is σ = 3332683200. Its totient is φ = 412065792.

The previous prime is 1213231039. The next prime is 1213231067. The reversal of 1213231040 is 401323121.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241676 + ... + 246644.

It is an arithmetic number, because the mean of its divisors is an integer number (29756100).

Almost surely, 2^1213231040 is an apocalyptic number.

1213231040 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 1213231040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1666341600).

1213231040 is an abundant number, since it is smaller than the sum of its proper divisors (2119452160).

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

1213231040 is a wasteful number, since it uses less digits than its factorization.

1213231040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102 (or 5092 counting only the distinct ones).

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

The square root of 1213231040 is about 34831.4662338524. The cubic root of 1213231040 is about 1066.5498795748.

Adding to 1213231040 its reverse (401323121), we get a palindrome (1614554161).

The spelling of 1213231040 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, forty".