2145680386 has 16 divisors (see below), whose sum is σ = 3291507864. Its totient is φ = 1048771584.

The previous prime is 2145680377. The next prime is 2145680401. The reversal of 2145680386 is 6830865412.

It can be written as a sum of positive squares in 4 ways, for example, as 1330863361 + 814817025 = 36481^2 + 28545^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 48531 + ... + 81526.

Almost surely, 2^2145680386 is an apocalyptic number.

2145680386 is a deficient number, since it is larger than the sum of its proper divisors (1145827478).

2145680386 is a wasteful number, since it uses less digits than its factorization.

2145680386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130245.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 2145680386 is about 46321.4894622356. The cubic root of 2145680386 is about 1289.7979344178.

The spelling of 2145680386 in words is "two billion, one hundred forty-five million, six hundred eighty thousand, three hundred eighty-six".