30990989 has 16 divisors (see below), whose sum is σ = 32736000. Its totient is φ = 29315520.

The previous prime is 30990961. The next prime is 30990997. The reversal of 30990989 is 98909903.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30990989 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30990689) 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 15 ways as a sum of consecutive naturals, for example, 284267 + ... + 284375.

It is an arithmetic number, because the mean of its divisors is an integer number (2046000).

Almost surely, 2^30990989 is an apocalyptic number.

It is an amenable number.

30990989 is a deficient number, since it is larger than the sum of its proper divisors (1745011).

30990989 is a wasteful number, since it uses less digits than its factorization.

30990989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 30990989 is about 5566.9550923283. The cubic root of 30990989 is about 314.1076246754.

The spelling of 30990989 in words is "thirty million, nine hundred ninety thousand, nine hundred eighty-nine".