2005156873 has 8 divisors (see below), whose sum is σ = 2067904520. Its totient is φ = 1942859520.

The previous prime is 2005156861. The next prime is 2005156877. The reversal of 2005156873 is 3786515002.

It can be written as a sum of positive squares in 4 ways, for example, as 1441189369 + 563967504 = 37963^2 + 23748^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005156873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2005156877) 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, 103518 + ... + 121351.

It is an arithmetic number, because the mean of its divisors is an integer number (258488065).

Almost surely, 2^2005156873 is an apocalyptic number.

It is an amenable number.

2005156873 is a deficient number, since it is larger than the sum of its proper divisors (62747647).

2005156873 is a wasteful number, since it uses less digits than its factorization.

2005156873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225147.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 2005156873 is about 44778.9780254083. The cubic root of 2005156873 is about 1261.0029959913.

The spelling of 2005156873 in words is "two billion, five million, one hundred fifty-six thousand, eight hundred seventy-three".