2155379856 has 240 divisors, whose sum is σ = 6699446208. Its totient is φ = 595123200.

The previous prime is 2155379851. The next prime is 2155379857. The reversal of 2155379856 is 6589735512.

It is a happy number.

Its product of digits (2268000) is a multiple of the sum of its prime factors (350).

It is a junction number, because it is equal to n+sod(n) for n = 2155379799 and 2155379808.

It is not an unprimeable number, because it can be changed into a prime (2155379851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11908086 + ... + 11908266.

Almost surely, 2^2155379856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155379856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3349723104).

2155379856 is an abundant number, since it is smaller than the sum of its proper divisors (4544066352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155379856 is a wasteful number, since it uses less digits than its factorization.

2155379856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 337 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 51.

The square root of 2155379856 is about 46426.0687114470. The cubic root of 2155379856 is about 1291.7385081059.

The spelling of 2155379856 in words is "two billion, one hundred fifty-five million, three hundred seventy-nine thousand, eight hundred fifty-six".