921874018 has 16 divisors (see below), whose sum is σ = 1529430840. Its totient is φ = 413980416.

The previous prime is 921873991. The next prime is 921874039. The reversal of 921874018 is 810478129.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 584527329 + 337346689 = 24177^2 + 18367^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478183 + ... + 480106.

Almost surely, 2^921874018 is an apocalyptic number.

921874018 is a deficient number, since it is larger than the sum of its proper divisors (607556822).

921874018 is a wasteful number, since it uses less digits than its factorization.

921874018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958341.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 921874018 is about 30362.3783324034. The cubic root of 921874018 is about 973.2487583933.

The spelling of 921874018 in words is "nine hundred twenty-one million, eight hundred seventy-four thousand, eighteen".