18945850 has 144 divisors (see below), whose sum is σ = 48345120. Its totient is φ = 5443200.

The previous prime is 18945821. The next prime is 18945877. The reversal of 18945850 is 5854981.

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 in 71 ways as a sum of consecutive naturals, for example, 512032 + ... + 512068.

It is an arithmetic number, because the mean of its divisors is an integer number (335730).

Almost surely, 2^18945850 is an apocalyptic number.

18945850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18945850 is an abundant number, since it is smaller than the sum of its proper divisors (29399270).

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

18945850 is a wasteful number, since it uses less digits than its factorization.

18945850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 18945850 is about 4352.6830805837. The cubic root of 18945850 is about 266.5864255103.

It can be divided in two parts, 1894 and 5850, that added together give a square (7744 = 88²).

The spelling of 18945850 in words is "eighteen million, nine hundred forty-five thousand, eight hundred fifty".