1989400618092 has 96 divisors (see below), whose sum is σ = 4695900160000. Its totient is φ = 655467204672.

The previous prime is 1989400618067. The next prime is 1989400618103. The reversal of 1989400618092 is 2908160049891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 995196909 + ... + 995198907.

Almost surely, 2^{1989400618092} is an apocalyptic number.

1989400618092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1989400618092 is an abundant number, since it is smaller than the sum of its proper divisors (2706499541908).

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

1989400618092 is a wasteful number, since it uses less digits than its factorization.

1989400618092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235 (or 4233 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 57.

The spelling of 1989400618092 in words is "one trillion, nine hundred eighty-nine billion, four hundred million, six hundred eighteen thousand, ninety-two".