1891439485 has 8 divisors (see below), whose sum is σ = 2444321880. Its totient is φ = 1396755264.

The previous prime is 1891439453. The next prime is 1891439491. The reversal of 1891439485 is 5849341981.

It can be written as a sum of positive squares in 4 ways, for example, as 307160676 + 1584278809 = 17526^2 + 39803^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1891439485 - 2⁵ = 1891439453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14549470 + ... + 14549599.

It is an arithmetic number, because the mean of its divisors is an integer number (305540235).

Almost surely, 2^1891439485 is an apocalyptic number.

It is an amenable number.

1891439485 is a deficient number, since it is larger than the sum of its proper divisors (552882395).

1891439485 is a wasteful number, since it uses less digits than its factorization.

1891439485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29099087.

The product of its digits is 1244160, while the sum is 52.

The square root of 1891439485 is about 43490.6827378003. The cubic root of 1891439485 is about 1236.6994006765.

The spelling of 1891439485 in words is "one billion, eight hundred ninety-one million, four hundred thirty-nine thousand, four hundred eighty-five".