2155342240 has 24 divisors (see below), whose sum is σ = 5091996420. Its totient is φ = 862136832.

The previous prime is 2155342199. The next prime is 2155342253. The reversal of 2155342240 is 422435512.

It can be written as a sum of positive squares in 2 ways, for example, as 2040509584 + 114832656 = 45172^2 + 10716^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2155342199 and 2155342208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6735285 + ... + 6735604.

Almost surely, 2^2155342240 is an apocalyptic number.

2155342240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155342240 is an abundant number, since it is smaller than the sum of its proper divisors (2936654180).

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

2155342240 is a wasteful number, since it uses less digits than its factorization.

2155342240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13470904 (or 13470896 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 2155342240 is about 46425.6635924571. The cubic root of 2155342240 is about 1291.7309935266.

Adding to 2155342240 its reverse (422435512), we get a palindrome (2577777752).

The spelling of 2155342240 in words is "two billion, one hundred fifty-five million, three hundred forty-two thousand, two hundred forty".