30945818 has 4 divisors (see below), whose sum is σ = 46418730. Its totient is φ = 15472908.

The previous prime is 30945809. The next prime is 30945821. The reversal of 30945818 is 81854903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81854903 = 13 ⋅6296531.

It can be written as a sum of positive squares in only one way, i.e., 23454649 + 7491169 = 4843^2 + 2737^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7736453 + ... + 7736456.

Almost surely, 2^30945818 is an apocalyptic number.

30945818 is a deficient number, since it is larger than the sum of its proper divisors (15472912).

30945818 is a wasteful number, since it uses less digits than its factorization.

30945818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15472911.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 30945818 is about 5562.8965476629. The cubic root of 30945818 is about 313.9549409967.

The spelling of 30945818 in words is "thirty million, nine hundred forty-five thousand, eight hundred eighteen".