1997943884123 has 4 divisors (see below), whose sum is σ = 2179575146328. Its totient is φ = 1816312621920.

The previous prime is 1997943884107. The next prime is 1997943884147. The reversal of 1997943884123 is 3214883497991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1997943884123 - 2⁴ = 1997943884107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997943884173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90815631086 + ... + 90815631107.

It is an arithmetic number, because the mean of its divisors is an integer number (544893786582).

Almost surely, 2^{1997943884123} is an apocalyptic number.

1997943884123 is a deficient number, since it is larger than the sum of its proper divisors (181631262205).

1997943884123 is a wasteful number, since it uses less digits than its factorization.

1997943884123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181631262204.

The product of its digits is 94058496, while the sum is 68.

The spelling of 1997943884123 in words is "one trillion, nine hundred ninety-seven billion, nine hundred forty-three million, eight hundred eighty-four thousand, one hundred twenty-three".