2155385344 has 120 divisors (see below), whose sum is σ = 5107343868. Its totient is φ = 905748480.

The previous prime is 2155385321. The next prime is 2155385347. The reversal of 2155385344 is 4435835512.

It can be written as a sum of positive squares in 2 ways, for example, as 2017087744 + 138297600 = 44912^2 + 11760^2 .

It is a super-2 number, since 2×2155385344² = 9291371962259996672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2155385297 and 2155385306.

It is not an unprimeable number, because it can be changed into a prime (2155385347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1328854 + ... + 1330474.

Almost surely, 2^2155385344 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 2155385344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2553671934).

2155385344 is an abundant number, since it is smaller than the sum of its proper divisors (2951958524).

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

2155385344 is an equidigital number, since it uses as much as digits as its factorization.

2155385344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1683 counting only the distinct ones).

The product of its digits is 288000, while the sum is 40.

The square root of 2155385344 is about 46426.1278161339. The cubic root of 2155385344 is about 1291.7396044409.

The spelling of 2155385344 in words is "two billion, one hundred fifty-five million, three hundred eighty-five thousand, three hundred forty-four".