1212487657920 has 1344 divisors, whose sum is σ = 5339159654400. Its totient is φ = 250358169600.

The previous prime is 1212487657861. The next prime is 1212487657943. The reversal of 1212487657920 is 297567842121.

1212487657920 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 48 + 7 + 6 + 579 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2618763609 + ... + 2618764071.

Almost surely, 2^{1212487657920} is an apocalyptic number.

1212487657920 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 1212487657920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2669579827200).

1212487657920 is an abundant number, since it is smaller than the sum of its proper divisors (4126671996480).

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

1212487657920 is a wasteful number, since it uses less digits than its factorization.

1212487657920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 1212487657920 in words is "one trillion, two hundred twelve billion, four hundred eighty-seven million, six hundred fifty-seven thousand, nine hundred twenty".