2128156823 has 8 divisors (see below), whose sum is σ = 2306461248. Its totient is φ = 1951938144.

The previous prime is 2128156819. The next prime is 2128156829. The reversal of 2128156823 is 3286518212.

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

It is not a de Polignac number, because 2128156823 - 2² = 2128156819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128156829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519311 + ... + 523392.

It is an arithmetic number, because the mean of its divisors is an integer number (288307656).

Almost surely, 2^2128156823 is an apocalyptic number.

2128156823 is a deficient number, since it is larger than the sum of its proper divisors (178304425).

2128156823 is a wasteful number, since it uses less digits than its factorization.

2128156823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042873.

The product of its digits is 46080, while the sum is 38.

The square root of 2128156823 is about 46131.9501322023. The cubic root of 2128156823 is about 1286.2771141290.

The spelling of 2128156823 in words is "two billion, one hundred twenty-eight million, one hundred fifty-six thousand, eight hundred twenty-three".