30047940 has 72 divisors (see below), whose sum is σ = 98164248. Its totient is φ = 7395840.

The previous prime is 30047939. The next prime is 30047947. The reversal of 30047940 is 4974003.

It can be written as a sum of positive squares in 4 ways, for example, as 367236 + 29680704 = 606^2 + 5448^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30047947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4081 + ... + 8760.

Almost surely, 2^30047940 is an apocalyptic number.

30047940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30047940 is an abundant number, since it is smaller than the sum of its proper divisors (68116308).

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

30047940 is a wasteful number, since it uses less digits than its factorization.

30047940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12869 (or 12864 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 30047940 is about 5481.6001313485. The cubic root of 30047940 is about 310.8886744290. Note that the first 3 decimals are identical.

The spelling of 30047940 in words is "thirty million, forty-seven thousand, nine hundred forty".