540215440 has 40 divisors (see below), whose sum is σ = 1256973120. Its totient is φ = 215918976.

The previous prime is 540215411. The next prime is 540215449. The reversal of 540215440 is 44512045.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×540215440² = 583665443228787200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (540215449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185677 + ... + 188563.

It is an arithmetic number, because the mean of its divisors is an integer number (31424328).

Almost surely, 2^540215440 is an apocalyptic number.

It is an amenable number.

540215440 is an abundant number, since it is smaller than the sum of its proper divisors (716757680).

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

540215440 is a wasteful number, since it uses less digits than its factorization.

540215440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239 (or 5233 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 540215440 is about 23242.5351457194. The cubic root of 540215440 is about 814.4335657892.

Adding to 540215440 its reverse (44512045), we get a palindrome (584727485).

The spelling of 540215440 in words is "five hundred forty million, two hundred fifteen thousand, four hundred forty".