1212742440 has 192 divisors, whose sum is σ = 4851100800. Its totient is φ = 255868416.

The previous prime is 1212742423. The next prime is 1212742471. The reversal of 1212742440 is 442472121.

1212742440 is a `hidden beast` number, since 1 + 212 + 7 + 4 + 2 + 440 = 666.

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, 14251 + ... + 51269.

It is an arithmetic number, because the mean of its divisors is an integer number (25266150).

Almost surely, 2^1212742440 is an apocalyptic number.

1212742440 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 1212742440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425550400).

1212742440 is an abundant number, since it is smaller than the sum of its proper divisors (3638358360).

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

1212742440 is a wasteful number, since it uses less digits than its factorization.

1212742440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37056 (or 37049 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 1212742440 is about 34824.4517544785. The cubic root of 1212742440 is about 1066.4066844687.

The spelling of 1212742440 in words is "one billion, two hundred twelve million, seven hundred forty-two thousand, four hundred forty".