1212512240 has 20 divisors (see below), whose sum is σ = 2819091144. Its totient is φ = 485004864.

The previous prime is 1212512221. The next prime is 1212512317. The reversal of 1212512240 is 422152121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7578122 + ... + 7578281.

Almost surely, 2^1212512240 is an apocalyptic number.

1212512240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212512240 is an abundant number, since it is smaller than the sum of its proper divisors (1606578904).

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

1212512240 is a wasteful number, since it uses less digits than its factorization.

1212512240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15156416 (or 15156410 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1212512240 is about 34821.1464486740. The cubic root of 1212512240 is about 1066.3392059053.

Adding to 1212512240 its reverse (422152121), we get a palindrome (1634664361).

The spelling of 1212512240 in words is "one billion, two hundred twelve million, five hundred twelve thousand, two hundred forty".