30403890 has 128 divisors (see below), whose sum is σ = 91756800. Its totient is φ = 7096320.

The previous prime is 30403889. The next prime is 30403931. The reversal of 30403890 is 9830403.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85954 + ... + 86306.

It is an arithmetic number, because the mean of its divisors is an integer number (716850).

Almost surely, 2^30403890 is an apocalyptic number.

30403890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30403890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45878400).

30403890 is an abundant number, since it is smaller than the sum of its proper divisors (61352910).

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

30403890 is a wasteful number, since it uses less digits than its factorization.

30403890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 30403890 is about 5513.9722523785. The cubic root of 30403890 is about 312.1114616550. Note that the first 3 decimals are identical.

The spelling of 30403890 in words is "thirty million, four hundred three thousand, eight hundred ninety".