1243785036538 has 96 divisors (see below), whose sum is σ = 2100199969728. Its totient is φ = 551906234880.

The previous prime is 1243785036521. The next prime is 1243785036583. The reversal of 1243785036538 is 8356305873421.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1005484456 + ... + 1005485692.

It is an arithmetic number, because the mean of its divisors is an integer number (21877083018).

Almost surely, 2^{1243785036538} is an apocalyptic number.

1243785036538 is a deficient number, since it is larger than the sum of its proper divisors (856414933190).

1243785036538 is a wasteful number, since it uses less digits than its factorization.

1243785036538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 1243785036538 in words is "one trillion, two hundred forty-three billion, seven hundred eighty-five million, thirty-six thousand, five hundred thirty-eight".