30099840 has 128 divisors (see below), whose sum is σ = 97895520. Its totient is φ = 7864320.

The previous prime is 30099763. The next prime is 30099841. The reversal of 30099840 is 4899003.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30099841) 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, 116992 + ... + 117248.

Almost surely, 2^30099840 is an apocalyptic number.

30099840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30099840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48947760).

30099840 is an abundant number, since it is smaller than the sum of its proper divisors (67795680).

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

30099840 is a wasteful number, since it uses less digits than its factorization.

30099840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 328 counting only the distinct ones).

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

The square root of 30099840 is about 5486.3321080664. The cubic root of 30099840 is about 311.0675645777.

The spelling of 30099840 in words is "thirty million, ninety-nine thousand, eight hundred forty".