2155639893 has 16 divisors (see below), whose sum is σ = 3136581696. Its totient is φ = 1305987840.

The previous prime is 2155639891. The next prime is 2155639909. The reversal of 2155639893 is 3989365512.

It is not a de Polignac number, because 2155639893 - 2¹ = 2155639891 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155639891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99471 + ... + 119187.

It is an arithmetic number, because the mean of its divisors is an integer number (196036356).

Almost surely, 2^2155639893 is an apocalyptic number.

It is an amenable number.

2155639893 is a deficient number, since it is larger than the sum of its proper divisors (980941803).

2155639893 is a wasteful number, since it uses less digits than its factorization.

2155639893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23044.

The product of its digits is 1749600, while the sum is 51.

The square root of 2155639893 is about 46428.8691764079. The cubic root of 2155639893 is about 1291.7904535203.

It can be divided in two parts, 215563 and 9893, that added together give a triangular number (225456 = T₆₇₁).

The spelling of 2155639893 in words is "two billion, one hundred fifty-five million, six hundred thirty-nine thousand, eight hundred ninety-three".