30540721 has 8 divisors (see below), whose sum is σ = 32793984. Its totient is φ = 28338240.

The previous prime is 30540703. The next prime is 30540737. The reversal of 30540721 is 12704503.

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 30540721 - 2⁷ = 30540593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30540692 and 30540701.

It is not an unprimeable number, because it can be changed into a prime (30540421) 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 7 ways as a sum of consecutive naturals, for example, 11445 + ... + 13858.

It is an arithmetic number, because the mean of its divisors is an integer number (4099248).

Almost surely, 2^30540721 is an apocalyptic number.

It is an amenable number.

30540721 is a deficient number, since it is larger than the sum of its proper divisors (2253263).

30540721 is a wasteful number, since it uses less digits than its factorization.

30540721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25391.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 30540721 is about 5526.3659849851. The cubic root of 30540721 is about 312.5789743867.

The spelling of 30540721 in words is "thirty million, five hundred forty thousand, seven hundred twenty-one".