30393440 has 96 divisors (see below), whose sum is σ = 89558784. Its totient is φ = 9469440.

The previous prime is 30393427. The next prime is 30393449. The reversal of 30393440 is 4439303.

It is a super-2 number, since 2×30393440² = 1847522390067200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30393449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11087 + ... + 13553.

It is an arithmetic number, because the mean of its divisors is an integer number (932904).

Almost surely, 2^30393440 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 30393440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44779392).

30393440 is an abundant number, since it is smaller than the sum of its proper divisors (59165344).

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

30393440 is a wasteful number, since it uses less digits than its factorization.

30393440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2492 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 30393440 is about 5513.0245782148. The cubic root of 30393440 is about 312.0756993614.

The spelling of 30393440 in words is "thirty million, three hundred ninety-three thousand, four hundred forty".