2139365985 has 8 divisors (see below), whose sum is σ = 3422985600. Its totient is φ = 1140995184.

The previous prime is 2139365957. The next prime is 2139366013. The reversal of 2139365985 is 5895639312.

It is an interprime number because it is at equal distance from previous prime (2139365957) and next prime (2139366013).

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

It is not a de Polignac number, because 2139365985 - 2⁸ = 2139365729 is a prime.

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, 71312185 + ... + 71312214.

It is an arithmetic number, because the mean of its divisors is an integer number (427873200).

Almost surely, 2^2139365985 is an apocalyptic number.

It is an amenable number.

2139365985 is a deficient number, since it is larger than the sum of its proper divisors (1283619615).

2139365985 is a wasteful number, since it uses less digits than its factorization.

2139365985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142624407.

The product of its digits is 1749600, while the sum is 51.

The square root of 2139365985 is about 46253.2808025550. The cubic root of 2139365985 is about 1288.5314668922.

It can be divided in two parts, 21393 and 65985, that added together give a palindrome (87378).

The spelling of 2139365985 in words is "two billion, one hundred thirty-nine million, three hundred sixty-five thousand, nine hundred eighty-five".