1989247135 has 4 divisors (see below), whose sum is σ = 2387096568. Its totient is φ = 1591397704.

The previous prime is 1989247109. The next prime is 1989247147. The reversal of 1989247135 is 5317429891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5317429891 = 39511 ⋅134581.

It is a cyclic number.

It is not a de Polignac number, because 1989247135 - 2⁵ = 1989247103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198924709 + ... + 198924718.

It is an arithmetic number, because the mean of its divisors is an integer number (596774142).

Almost surely, 2^1989247135 is an apocalyptic number.

1989247135 is a deficient number, since it is larger than the sum of its proper divisors (397849433).

1989247135 is an equidigital number, since it uses as much as digits as its factorization.

1989247135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397849432.

The product of its digits is 544320, while the sum is 49.

The square root of 1989247135 is about 44600.9768390783. The cubic root of 1989247135 is about 1257.6590310144.

The spelling of 1989247135 in words is "one billion, nine hundred eighty-nine million, two hundred forty-seven thousand, one hundred thirty-five".