1234687643388 has 36 divisors (see below), whose sum is σ = 3122432899768. Its totient is φ = 411375702240.

The previous prime is 1234687643381. The next prime is 1234687643533. The reversal of 1234687643388 is 8833467864321.

1234687643388 is a `hidden beast` number, since 1 + 2 + 3 + 46 + 87 + 6 + 433 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×1234687643388³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234687643381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7704823 + ... + 7863438.

Almost surely, 2^{1234687643388} is an apocalyptic number.

1234687643388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1234687643388 is an abundant number, since it is smaller than the sum of its proper divisors (1887745256380).

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

1234687643388 is a wasteful number, since it uses less digits than its factorization.

1234687643388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15570474 (or 15570469 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 63.

The spelling of 1234687643388 in words is "one trillion, two hundred thirty-four billion, six hundred eighty-seven million, six hundred forty-three thousand, three hundred eighty-eight".