18858012 has 24 divisors (see below), whose sum is σ = 45192336. Its totient is φ = 6115968.

The previous prime is 18857989. The next prime is 18858019. The reversal of 18858012 is 21085881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18858019) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 20793 + ... + 21680.

It is an arithmetic number, because the mean of its divisors is an integer number (1883014).

Almost surely, 2^18858012 is an apocalyptic number.

18858012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18858012 is an abundant number, since it is smaller than the sum of its proper divisors (26334324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18858012 is a wasteful number, since it uses less digits than its factorization.

18858012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42517 (or 42515 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 18858012 is about 4342.5812600342. The cubic root of 18858012 is about 266.1737986432.

The spelling of 18858012 in words is "eighteen million, eight hundred fifty-eight thousand, twelve".