30889840 has 40 divisors (see below), whose sum is σ = 72548928. Its totient is φ = 12230400.

The previous prime is 30889819. The next prime is 30889841. The reversal of 30889840 is 4898803.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 30889793 and 30889802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30889841) 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, 6169 + ... + 9991.

Almost surely, 2^30889840 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 30889840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36274464).

30889840 is an abundant number, since it is smaller than the sum of its proper divisors (41659088).

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

30889840 is a wasteful number, since it uses less digits than its factorization.

30889840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937 (or 3931 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 30889840 is about 5557.8628986329. The cubic root of 30889840 is about 313.7655220016.

The spelling of 30889840 in words is "thirty million, eight hundred eighty-nine thousand, eight hundred forty".