1212231240 has 288 divisors, whose sum is σ = 4588005240. Its totient is φ = 276418560.

The previous prime is 1212231227. The next prime is 1212231253. The reversal of 1212231240 is 421322121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212231227) and next prime (1212231253).

It can be written as a sum of positive squares in 4 ways, for example, as 801682596 + 410548644 = 28314^2 + 20262^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 739702 + ... + 741338.

Almost surely, 2^1212231240 is an apocalyptic number.

1212231240 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 1212231240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2294002620).

1212231240 is an abundant number, since it is smaller than the sum of its proper divisors (3375774000).

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

1212231240 is a wasteful number, since it uses less digits than its factorization.

1212231240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 1675 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1212231240 is about 34817.1113103887. Note that the first 3 decimals coincide. The cubic root of 1212231240 is about 1066.2568247528.

Adding to 1212231240 its reverse (421322121), we get a palindrome (1633553361).

The spelling of 1212231240 in words is "one billion, two hundred twelve million, two hundred thirty-one thousand, two hundred forty".