30809940 has 96 divisors (see below), whose sum is σ = 99644160. Its totient is φ = 6967296.

The previous prime is 30809923. The next prime is 30809951. The reversal of 30809940 is 4990803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45444 + ... + 46116.

It is an arithmetic number, because the mean of its divisors is an integer number (1037960).

Almost surely, 2^30809940 is an apocalyptic number.

30809940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30809940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49822080).

30809940 is an abundant number, since it is smaller than the sum of its proper divisors (68834220).

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

30809940 is a wasteful number, since it uses less digits than its factorization.

30809940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 30809940 is about 5550.6702298011. The cubic root of 30809940 is about 313.4947586302.

The spelling of 30809940 in words is "thirty million, eight hundred nine thousand, nine hundred forty".