30000978 has 24 divisors (see below), whose sum is σ = 74288448. Its totient is φ = 8571672.

The previous prime is 30000977. The next prime is 30000989. The reversal of 30000978 is 87900003.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (30000977) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 118926 + ... + 119177.

It is an arithmetic number, because the mean of its divisors is an integer number (3095352).

Almost surely, 2^30000978 is an apocalyptic number.

30000978 is an abundant number, since it is smaller than the sum of its proper divisors (44287470).

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

30000978 is a wasteful number, since it uses less digits than its factorization.

30000978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238118 (or 238115 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 30000978 is about 5477.3148531009. The cubic root of 30000978 is about 310.7266270847.

The spelling of 30000978 in words is "thirty million, nine hundred seventy-eight", and thus it is an aban number.