540349721 has 16 divisors (see below), whose sum is σ = 590587200. Its totient is φ = 492424128.

The previous prime is 540349673. The next prime is 540349769. The reversal of 540349721 is 127943045.

It is an interprime number because it is at equal distance from previous prime (540349673) and next prime (540349769).

It is a cyclic number.

It is not a de Polignac number, because 540349721 - 2⁶ = 540349657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540349421) 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, 159770 + ... + 163116.

It is an arithmetic number, because the mean of its divisors is an integer number (36911700).

Almost surely, 2^540349721 is an apocalyptic number.

It is an amenable number.

540349721 is a deficient number, since it is larger than the sum of its proper divisors (50237479).

540349721 is a wasteful number, since it uses less digits than its factorization.

540349721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 540349721 is about 23245.4236571416. The cubic root of 540349721 is about 814.5010412724.

The spelling of 540349721 in words is "five hundred forty million, three hundred forty-nine thousand, seven hundred twenty-one".