1989278753 has 8 divisors (see below), whose sum is σ = 2480139840. Its totient is φ = 1550087280.

The previous prime is 1989278737. The next prime is 1989278779. The reversal of 1989278753 is 3578729891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1989278753 - 2⁴ = 1989278737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1989278692 and 1989278701.

It is not an unprimeable number, because it can be changed into a prime (1989278723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12917318 + ... + 12917471.

It is an arithmetic number, because the mean of its divisors is an integer number (310017480).

Almost surely, 2^1989278753 is an apocalyptic number.

It is an amenable number.

1989278753 is a deficient number, since it is larger than the sum of its proper divisors (490861087).

1989278753 is a wasteful number, since it uses less digits than its factorization.

1989278753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25834807.

The product of its digits is 7620480, while the sum is 59.

The square root of 1989278753 is about 44601.3312917899. The cubic root of 1989278753 is about 1257.6656942476.

The spelling of 1989278753 in words is "one billion, nine hundred eighty-nine million, two hundred seventy-eight thousand, seven hundred fifty-three".