30891042 has 48 divisors (see below), whose sum is σ = 82380480. Its totient is φ = 8146656.

The previous prime is 30891031. The next prime is 30891059. The reversal of 30891042 is 24019803.

It is a junction number, because it is equal to n+sod(n) for n = 30890997 and 30891015.

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 23 ways as a sum of consecutive naturals, for example, 7792 + ... + 11067.

It is an arithmetic number, because the mean of its divisors is an integer number (1716260).

Almost surely, 2^30891042 is an apocalyptic number.

30891042 is an abundant number, since it is smaller than the sum of its proper divisors (51489438).

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

30891042 is a wasteful number, since it uses less digits than its factorization.

30891042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18887 (or 18884 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 30891042 is about 5557.9710326701. The cubic root of 30891042 is about 313.7695917460.

The spelling of 30891042 in words is "thirty million, eight hundred ninety-one thousand, forty-two".