2156020726 has 4 divisors (see below), whose sum is σ = 3234031092. Its totient is φ = 1078010362.

The previous prime is 2156020717. The next prime is 2156020729. The reversal of 2156020726 is 6270206512.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156020729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539005180 + ... + 539005183.

It is an arithmetic number, because the mean of its divisors is an integer number (808507773).

Almost surely, 2^2156020726 is an apocalyptic number.

2156020726 is a deficient number, since it is larger than the sum of its proper divisors (1078010366).

2156020726 is a wasteful number, since it uses less digits than its factorization.

2156020726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078010365.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 2156020726 is about 46432.9702474438. The cubic root of 2156020726 is about 1291.8665218016.

The spelling of 2156020726 in words is "two billion, one hundred fifty-six million, twenty thousand, seven hundred twenty-six".