30838940 has 24 divisors (see below), whose sum is σ = 70649712. Its totient is φ = 11214080.

The previous prime is 30838937. The next prime is 30838949. The reversal of 30838940 is 4983803.

It is a self number, because there is not a number n which added to its sum of digits gives 30838940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30838949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69869 + ... + 70308.

It is an arithmetic number, because the mean of its divisors is an integer number (2943738).

Almost surely, 2^30838940 is an apocalyptic number.

It is an amenable number.

30838940 is an abundant number, since it is smaller than the sum of its proper divisors (39810772).

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

30838940 is a wasteful number, since it uses less digits than its factorization.

30838940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140197 (or 140195 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 30838940 is about 5553.2819125270. The cubic root of 30838940 is about 313.5930872548.

The spelling of 30838940 in words is "thirty million, eight hundred thirty-eight thousand, nine hundred forty".