2155457839 has 4 divisors (see below), whose sum is σ = 2157475240. Its totient is φ = 2153440440.

The previous prime is 2155457833. The next prime is 2155457873. The reversal of 2155457839 is 9387545512.

2155457839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2155457839 - 2²³ = 2147069231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2155457792 and 2155457801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155457833) 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, 1007097 + ... + 1009234.

It is an arithmetic number, because the mean of its divisors is an integer number (539368810).

Almost surely, 2^2155457839 is an apocalyptic number.

2155457839 is a deficient number, since it is larger than the sum of its proper divisors (2017401).

2155457839 is a wasteful number, since it uses less digits than its factorization.

2155457839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017400.

The product of its digits is 1512000, while the sum is 49.

The square root of 2155457839 is about 46426.9085660460. The cubic root of 2155457839 is about 1291.7540865555.

The spelling of 2155457839 in words is "two billion, one hundred fifty-five million, four hundred fifty-seven thousand, eight hundred thirty-nine".