2158823972 has 12 divisors (see below), whose sum is σ = 3778875660. Its totient is φ = 1079145216.

The previous prime is 2158823971. The next prime is 2158824011. The reversal of 2158823972 is 2793288512.

It can be written as a sum of positive squares in 2 ways, for example, as 935503396 + 1223320576 = 30586^2 + 34976^2 .

It is not an unprimeable number, because it can be changed into a prime (2158823971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47897 + ... + 81312.

It is an arithmetic number, because the mean of its divisors is an integer number (314906305).

Almost surely, 2^2158823972 is an apocalyptic number.

It is an amenable number.

2158823972 is a deficient number, since it is larger than the sum of its proper divisors (1620051688).

2158823972 is a wasteful number, since it uses less digits than its factorization.

2158823972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133390 (or 133388 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 2158823972 is about 46463.1463850652. The cubic root of 2158823972 is about 1292.4261718446.

The spelling of 2158823972 in words is "two billion, one hundred fifty-eight million, eight hundred twenty-three thousand, nine hundred seventy-two".