1289238385 has 16 divisors (see below), whose sum is σ = 1606256640. Its totient is φ = 992329920.

The previous prime is 1289238347. The next prime is 1289238403. The reversal of 1289238385 is 5838329821.

It is not a de Polignac number, because 1289238385 - 2¹³ = 1289230193 is a prime.

It is a super-2 number, since 2×1289238385² = 3324271226714816450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776 + ... + 50854.

It is an arithmetic number, because the mean of its divisors is an integer number (100391040).

Almost surely, 2^1289238385 is an apocalyptic number.

It is an amenable number.

1289238385 is a deficient number, since it is larger than the sum of its proper divisors (317018255).

1289238385 is a wasteful number, since it uses less digits than its factorization.

1289238385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48288.

The product of its digits is 829440, while the sum is 49.

The square root of 1289238385 is about 35905.9658691978. The cubic root of 1289238385 is about 1088.3729575917.

The spelling of 1289238385 in words is "one billion, two hundred eighty-nine million, two hundred thirty-eight thousand, three hundred eighty-five".