30947440 has 40 divisors (see below), whose sum is σ = 72526608. Its totient is φ = 12280320.

The previous prime is 30947431. The next prime is 30947453. The reversal of 30947440 is 4474903.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9004 + ... + 11956.

Almost surely, 2^30947440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30947440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36263304).

30947440 is an abundant number, since it is smaller than the sum of its proper divisors (41579168).

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

30947440 is a wasteful number, since it uses less digits than its factorization.

30947440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097 (or 3091 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 30947440 is about 5563.0423331123. The cubic root of 30947440 is about 313.9604261322.

The spelling of 30947440 in words is "thirty million, nine hundred forty-seven thousand, four hundred forty".