30478138 has 4 divisors (see below), whose sum is σ = 45717210. Its totient is φ = 15239068.

The previous prime is 30478117. The next prime is 30478141. The reversal of 30478138 is 83187403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83187403 = 13 ⋅6399031.

It can be written as a sum of positive squares in only one way, i.e., 22877089 + 7601049 = 4783^2 + 2757^2 .

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 as a sum of consecutive naturals, namely, 7619533 + ... + 7619536.

Almost surely, 2^30478138 is an apocalyptic number.

30478138 is a deficient number, since it is larger than the sum of its proper divisors (15239072).

30478138 is a wasteful number, since it uses less digits than its factorization.

30478138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15239071.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 30478138 is about 5520.7008613038. The cubic root of 30478138 is about 312.3653196709.

The spelling of 30478138 in words is "thirty million, four hundred seventy-eight thousand, one hundred thirty-eight".