2605139798 has 4 divisors (see below), whose sum is σ = 3907709700. Its totient is φ = 1302569898.

The previous prime is 2605139783. The next prime is 2605139819. The reversal of 2605139798 is 8979315062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8979315062 = 2 ⋅4489657531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651284948 + ... + 651284951.

It is an arithmetic number, because the mean of its divisors is an integer number (976927425).

Almost surely, 2^2605139798 is an apocalyptic number.

2605139798 is a deficient number, since it is larger than the sum of its proper divisors (1302569902).

2605139798 is a wasteful number, since it uses less digits than its factorization.

2605139798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302569901.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 2605139798 is about 51040.5701182892. The cubic root of 2605139798 is about 1375.9743701706.

The spelling of 2605139798 in words is "two billion, six hundred five million, one hundred thirty-nine thousand, seven hundred ninety-eight".