1212532140 has 144 divisors (see below), whose sum is σ = 3717506016. Its totient is φ = 294266880.

The previous prime is 1212532127. The next prime is 1212532183. The reversal of 1212532140 is 412352121.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 979602 + ... + 980838.

It is an arithmetic number, because the mean of its divisors is an integer number (25816014).

Almost surely, 2^1212532140 is an apocalyptic number.

1212532140 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 1212532140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858753008).

1212532140 is an abundant number, since it is smaller than the sum of its proper divisors (2504973876).

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

1212532140 is a wasteful number, since it uses less digits than its factorization.

1212532140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1295 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1212532140 is about 34821.4321934064. The cubic root of 1212532140 is about 1066.3450395327.

Adding to 1212532140 its reverse (412352121), we get a palindrome (1624884261).

The spelling of 1212532140 in words is "one billion, two hundred twelve million, five hundred thirty-two thousand, one hundred forty".