2155433040 has 240 divisors, whose sum is σ = 7661152512. Its totient is φ = 541956096.

The previous prime is 2155433029. The next prime is 2155433047. The reversal of 2155433040 is 403345512.

It is a tau number, because it is divible by the number of its divisors (240).

It is a junction number, because it is equal to n+sod(n) for n = 2155432995 and 2155433013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155433047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1207989 + ... + 1209771.

Almost surely, 2^2155433040 is an apocalyptic number.

2155433040 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 2155433040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3830576256).

2155433040 is an abundant number, since it is smaller than the sum of its proper divisors (5505719472).

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

2155433040 is a wasteful number, since it uses less digits than its factorization.

2155433040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 2155433040 is about 46426.6414895586. The cubic root of 2155433040 is about 1291.7491325682.

Adding to 2155433040 its reverse (403345512), we get a palindrome (2558778552).

The spelling of 2155433040 in words is "two billion, one hundred fifty-five million, four hundred thirty-three thousand, forty".