1212611440 has 20 divisors (see below), whose sum is σ = 2819321784. Its totient is φ = 485044544.

The previous prime is 1212611401. The next prime is 1212611443. The reversal of 1212611440 is 441162121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212611443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7578742 + ... + 7578901.

Almost surely, 2^1212611440 is an apocalyptic number.

1212611440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212611440 is an abundant number, since it is smaller than the sum of its proper divisors (1606710344).

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

1212611440 is a wasteful number, since it uses less digits than its factorization.

1212611440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15157656 (or 15157650 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1212611440 is about 34822.5708413379. The cubic root of 1212611440 is about 1066.3682854645.

Adding to 1212611440 its reverse (441162121), we get a palindrome (1653773561).

The spelling of 1212611440 in words is "one billion, two hundred twelve million, six hundred eleven thousand, four hundred forty".