2155524240 has 80 divisors (see below), whose sum is σ = 6897701376. Its totient is φ = 556262400.

The previous prime is 2155524229. The next prime is 2155524247. The reversal of 2155524240 is 424255512.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 2155524198 and 2155524207.

It is not an unprimeable number, because it can be changed into a prime (2155524247) 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 15 ways as a sum of consecutive naturals, for example, 137421 + ... + 152300.

Almost surely, 2^2155524240 is an apocalyptic number.

2155524240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155524240 is an abundant number, since it is smaller than the sum of its proper divisors (4742177136).

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

2155524240 is a wasteful number, since it uses less digits than its factorization.

2155524240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289768 (or 289762 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 2155524240 is about 46427.6236738431. The cubic root of 2155524240 is about 1291.7673510046.

Adding to 2155524240 its reverse (424255512), we get a palindrome (2579779752).

The spelling of 2155524240 in words is "two billion, one hundred fifty-five million, five hundred twenty-four thousand, two hundred forty".