30278381 has 16 divisors (see below), whose sum is σ = 36610560. Its totient is φ = 24462000.

The previous prime is 30278359. The next prime is 30278383. The reversal of 30278381 is 18387203.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30278381 is a prime.

It is a super-2 number, since 2×30278381² = 1833560711962322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30278383) 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 15 ways as a sum of consecutive naturals, for example, 32930 + ... + 33836.

It is an arithmetic number, because the mean of its divisors is an integer number (2288160).

Almost surely, 2^30278381 is an apocalyptic number.

It is an amenable number.

30278381 is a deficient number, since it is larger than the sum of its proper divisors (6332179).

30278381 is a wasteful number, since it uses less digits than its factorization.

30278381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 30278381 is about 5502.5794860229. The cubic root of 30278381 is about 311.6813980029.

The spelling of 30278381 in words is "thirty million, two hundred seventy-eight thousand, three hundred eighty-one".