1219997786943 has 32 divisors (see below), whose sum is σ = 1828112509440. Its totient is φ = 718064519040.

The previous prime is 1219997786933. The next prime is 1219997787007. The reversal of 1219997786943 is 3496877999121.

It is not a de Polignac number, because 1219997786943 - 2⁴ = 1219997786927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219997786933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11815008 + ... + 11917818.

It is an arithmetic number, because the mean of its divisors is an integer number (57128515920).

Almost surely, 2^{1219997786943} is an apocalyptic number.

1219997786943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1219997786943 is a deficient number, since it is larger than the sum of its proper divisors (608114722497).

1219997786943 is a wasteful number, since it uses less digits than its factorization.

1219997786943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116079.

The product of its digits is 370355328, while the sum is 75.

The spelling of 1219997786943 in words is "one trillion, two hundred nineteen billion, nine hundred ninety-seven million, seven hundred eighty-six thousand, nine hundred forty-three".