30409890 has 96 divisors (see below), whose sum is σ = 86085504. Its totient is φ = 6854400.

The previous prime is 30409879. The next prime is 30409909. The reversal of 30409890 is 9890403.

It is a super-2 number, since 2×30409890² = 1849522819624200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201315 + ... + 201465.

It is an arithmetic number, because the mean of its divisors is an integer number (896724).

Almost surely, 2^30409890 is an apocalyptic number.

30409890 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 30409890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43042752).

30409890 is an abundant number, since it is smaller than the sum of its proper divisors (55675614).

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

30409890 is a wasteful number, since it uses less digits than its factorization.

30409890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 30409890 is about 5514.5162979177. The cubic root of 30409890 is about 312.1319913262.

The spelling of 30409890 in words is "thirty million, four hundred nine thousand, eight hundred ninety".