2155533240 has 256 divisors, whose sum is σ = 7664025600. Its totient is φ = 474776064.

The previous prime is 2155533239. The next prime is 2155533253. The reversal of 2155533240 is 423355512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2155533198 and 2155533207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2997601 + ... + 2998319.

It is an arithmetic number, because the mean of its divisors is an integer number (29937600).

Almost surely, 2^2155533240 is an apocalyptic number.

2155533240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155533240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3832012800).

2155533240 is an abundant number, since it is smaller than the sum of its proper divisors (5508492360).

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

2155533240 is a wasteful number, since it uses less digits than its factorization.

2155533240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 2155533240 is about 46427.7205987974. The cubic root of 2155533240 is about 1291.7691488487.

Adding to 2155533240 its reverse (423355512), we get a palindrome (2578888752).

The spelling of 2155533240 in words is "two billion, one hundred fifty-five million, five hundred thirty-three thousand, two hundred forty".