30689021 has 8 divisors (see below), whose sum is σ = 34384224. Its totient is φ = 27144720.

The previous prime is 30689003. The next prime is 30689023. The reversal of 30689021 is 12098603.

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 30689021 - 2¹⁰ = 30687997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30689023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37295 + ... + 38108.

It is an arithmetic number, because the mean of its divisors is an integer number (4298028).

Almost surely, 2^30689021 is an apocalyptic number.

It is an amenable number.

30689021 is a deficient number, since it is larger than the sum of its proper divisors (3695203).

30689021 is a wasteful number, since it uses less digits than its factorization.

30689021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75451.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 30689021 is about 5539.7672333772. The cubic root of 30689021 is about 313.0840992496.

The spelling of 30689021 in words is "thirty million, six hundred eighty-nine thousand, twenty-one".