30489520 has 40 divisors (see below), whose sum is σ = 71330256. Its totient is φ = 12119808.

The previous prime is 30489491. The next prime is 30489533. The reversal of 30489520 is 2598403.

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

It is a super-2 number, since 2×30489520² = 1859221659660800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12739 + ... + 14941.

Almost surely, 2^30489520 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 30489520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35665128).

30489520 is an abundant number, since it is smaller than the sum of its proper divisors (40840736).

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

30489520 is a wasteful number, since it uses less digits than its factorization.

30489520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389 (or 2383 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 30489520 is about 5521.7316124564. The cubic root of 30489520 is about 312.4041989005.

The spelling of 30489520 in words is "thirty million, four hundred eighty-nine thousand, five hundred twenty".