30378138 has 64 divisors (see below), whose sum is σ = 73440000. Its totient is φ = 8363712.

The previous prime is 30378119. The next prime is 30378143. The reversal of 30378138 is 83187303.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30378099 and 30378108.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 59428 + ... + 59936.

It is an arithmetic number, because the mean of its divisors is an integer number (1147500).

Almost surely, 2^30378138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30378138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36720000).

30378138 is an abundant number, since it is smaller than the sum of its proper divisors (43061862).

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

30378138 is a wasteful number, since it uses less digits than its factorization.

30378138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 30378138 is about 5511.6365990511. The cubic root of 30378138 is about 312.0233176196.

It can be divided in two parts, 3037 and 8138, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 30378138 in words is "thirty million, three hundred seventy-eight thousand, one hundred thirty-eight".