30491120 has 40 divisors (see below), whose sum is σ = 77338800. Its totient is φ = 11087360.

The previous prime is 30491113. The next prime is 30491137. The reversal of 30491120 is 2119403.

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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 30491092 and 30491101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16445 + ... + 18204.

It is an arithmetic number, because the mean of its divisors is an integer number (1933470).

Almost surely, 2^30491120 is an apocalyptic number.

It is an amenable number.

30491120 is an abundant number, since it is smaller than the sum of its proper divisors (46847680).

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

30491120 is a wasteful number, since it uses less digits than its factorization.

30491120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34673 (or 34667 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 30491120 is about 5521.8764926427. The cubic root of 30491120 is about 312.4096634883.

The spelling of 30491120 in words is "thirty million, four hundred ninety-one thousand, one hundred twenty".