2158820386 has 16 divisors (see below), whose sum is σ = 3286395648. Its totient is φ = 1063389600.

The previous prime is 2158820357. The next prime is 2158820393. The reversal of 2158820386 is 6830288512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124891 + ... + 141121.

It is an arithmetic number, because the mean of its divisors is an integer number (205399728).

Almost surely, 2^2158820386 is an apocalyptic number.

2158820386 is a deficient number, since it is larger than the sum of its proper divisors (1127575262).

2158820386 is a wasteful number, since it uses less digits than its factorization.

2158820386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17217.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 2158820386 is about 46463.1077953251. The cubic root of 2158820386 is about 1292.4254562323.

The spelling of 2158820386 in words is "two billion, one hundred fifty-eight million, eight hundred twenty thousand, three hundred eighty-six".