30999906 has 96 divisors (see below), whose sum is σ = 84464640. Its totient is φ = 8011872.

The previous prime is 30999893. The next prime is 30999911. The reversal of 30999906 is 60999903.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 54781 + ... + 55343.

It is an arithmetic number, because the mean of its divisors is an integer number (879840).

Almost surely, 2^30999906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30999906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42232320).

30999906 is an abundant number, since it is smaller than the sum of its proper divisors (53464734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30999906 is a wasteful number, since it uses less digits than its factorization.

30999906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 30999906 is about 5567.7559213744. The cubic root of 30999906 is about 314.1377477229.

The spelling of 30999906 in words is "thirty million, nine hundred ninety-nine thousand, nine hundred six".