1989408695296 has 99 divisors (see below), whose sum is σ = 4372366578307. Its totient is φ = 904051005440.

The previous prime is 1989408695291. The next prime is 1989408695297. The reversal of 1989408695296 is 6925968049891.

The square root of 1989408695296 is 1410464.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989408695291) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 496481325 + ... + 496485331.

Almost surely, 2^{1989408695296} is an apocalyptic number.

1989408695296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1989408695296 is the 1410464-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989408695296

1989408695296 is an abundant number, since it is smaller than the sum of its proper divisors (2382957883011).

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

1989408695296 is an frugal number, since it uses more digits than its factorization.

1989408695296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8056 (or 4020 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 76.

The spelling of 1989408695296 in words is "one trillion, nine hundred eighty-nine billion, four hundred eight million, six hundred ninety-five thousand, two hundred ninety-six".