1243787640238 has 64 divisors (see below), whose sum is σ = 2243116592640. Its totient is φ = 509797411200.

The previous prime is 1243787640191. The next prime is 1243787640241. The reversal of 1243787640238 is 8320467873421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1932381 + ... + 2494327.

It is an arithmetic number, because the mean of its divisors is an integer number (35048696760).

Almost surely, 2^{1243787640238} is an apocalyptic number.

1243787640238 is a deficient number, since it is larger than the sum of its proper divisors (999328952402).

1243787640238 is a wasteful number, since it uses less digits than its factorization.

1243787640238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562153.

The product of its (nonzero) digits is 10838016, while the sum is 55.

The spelling of 1243787640238 in words is "one trillion, two hundred forty-three billion, seven hundred eighty-seven million, six hundred forty thousand, two hundred thirty-eight".