540249721 has 16 divisors (see below), whose sum is σ = 611601408. Its totient is φ = 472928400.

The previous prime is 540249709. The next prime is 540249751. The reversal of 540249721 is 127942045.

It is a cyclic number.

It is not a de Polignac number, because 540249721 - 2¹³ = 540241529 is a prime.

It is a super-2 number, since 2×540249721² = 583739522081155682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (540249751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25540 + ... + 41626.

It is an arithmetic number, because the mean of its divisors is an integer number (38225088).

Almost surely, 2^540249721 is an apocalyptic number.

It is an amenable number.

540249721 is a deficient number, since it is larger than the sum of its proper divisors (71351687).

540249721 is a wasteful number, since it uses less digits than its factorization.

540249721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16212.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 540249721 is about 23243.2725966031. The cubic root of 540249721 is about 814.4507928709.

The spelling of 540249721 in words is "five hundred forty million, two hundred forty-nine thousand, seven hundred twenty-one".