30239640 has 96 divisors (see below), whose sum is σ = 103474800. Its totient is φ = 7637760.

The previous prime is 30239633. The next prime is 30239669. The reversal of 30239640 is 4693203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4630 + ... + 9050.

Almost surely, 2^30239640 is an apocalyptic number.

30239640 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 30239640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51737400).

30239640 is an abundant number, since it is smaller than the sum of its proper divisors (73235160).

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

30239640 is a wasteful number, since it uses less digits than its factorization.

30239640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457 (or 4450 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 30239640 is about 5499.0581011661. The cubic root of 30239640 is about 311.5484097980.

The spelling of 30239640 in words is "thirty million, two hundred thirty-nine thousand, six hundred forty".