540640121 has 8 divisors (see below), whose sum is σ = 629532864. Its totient is φ = 454662000.

The previous prime is 540640081. The next prime is 540640123. The reversal of 540640121 is 121046045.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 540640121 - 2⁶ = 540640057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540640123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728255 + ... + 728996.

It is an arithmetic number, because the mean of its divisors is an integer number (78691608).

Almost surely, 2^540640121 is an apocalyptic number.

It is an amenable number.

540640121 is a deficient number, since it is larger than the sum of its proper divisors (88892743).

540640121 is a wasteful number, since it uses less digits than its factorization.

540640121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457311.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 540640121 is about 23251.6692088977. The cubic root of 540640121 is about 814.6469274969.

Adding to 540640121 its reverse (121046045), we get a palindrome (661686166).

The spelling of 540640121 in words is "five hundred forty million, six hundred forty thousand, one hundred twenty-one".