30721369 has 8 divisors (see below), whose sum is σ = 35686208. Its totient is φ = 25900560.

The previous prime is 30721357. The next prime is 30721381. The reversal of 30721369 is 96312703.

It is an interprime number because it is at equal distance from previous prime (30721357) and next prime (30721381).

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

It is not a de Polignac number, because 30721369 - 2⁵ = 30721337 is a prime.

It is a super-2 number, since 2×30721369² = 1887605026468322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30721369.

It is not an unprimeable number, because it can be changed into a prime (30721349) 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, 35547 + ... + 36400.

It is an arithmetic number, because the mean of its divisors is an integer number (4460776).

Almost surely, 2^30721369 is an apocalyptic number.

It is an amenable number.

30721369 is a deficient number, since it is larger than the sum of its proper divisors (4964839).

30721369 is an equidigital number, since it uses as much as digits as its factorization.

30721369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72015.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 30721369 is about 5542.6860816756. The cubic root of 30721369 is about 313.1940635280.

The spelling of 30721369 in words is "thirty million, seven hundred twenty-one thousand, three hundred sixty-nine".