2139305845 has 8 divisors (see below), whose sum is σ = 2569935960. Its totient is φ = 1709598720.

The previous prime is 2139305837. The next prime is 2139305887. The reversal of 2139305845 is 5485039312.

It can be written as a sum of positive squares in 4 ways, for example, as 41757444 + 2097548401 = 6462^2 + 45799^2 .

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

It is not a de Polignac number, because 2139305845 - 2³ = 2139305837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2139305798 and 2139305807.

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, 225636 + ... + 234925.

It is an arithmetic number, because the mean of its divisors is an integer number (321241995).

Almost surely, 2^2139305845 is an apocalyptic number.

It is an amenable number.

2139305845 is a deficient number, since it is larger than the sum of its proper divisors (430630115).

2139305845 is an equidigital number, since it uses as much as digits as its factorization.

2139305845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461495.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 2139305845 is about 46252.6306819407. The cubic root of 2139305845 is about 1288.5193927529.

The spelling of 2139305845 in words is "two billion, one hundred thirty-nine million, three hundred five thousand, eight hundred forty-five".