30019918 has 4 divisors (see below), whose sum is σ = 45029880. Its totient is φ = 15009958.

The previous prime is 30019903. The next prime is 30019931. The reversal of 30019918 is 81991003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81991003 = 409 ⋅200467.

It is a self number, because there is not a number n which added to its sum of digits gives 30019918.

It is a congruent number.

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, 7504978 + ... + 7504981.

It is an arithmetic number, because the mean of its divisors is an integer number (11257470).

Almost surely, 2^30019918 is an apocalyptic number.

30019918 is a deficient number, since it is larger than the sum of its proper divisors (15009962).

30019918 is a wasteful number, since it uses less digits than its factorization.

30019918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15009961.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 30019918 is about 5479.0435296683. The cubic root of 30019918 is about 310.7920018900.

The spelling of 30019918 in words is "thirty million, nineteen thousand, nine hundred eighteen".