18194890 has 32 divisors (see below), whose sum is σ = 38724480. Its totient is φ = 6022464.

The previous prime is 18194881. The next prime is 18194903. The reversal of 18194890 is 9849181.

It is a super-2 number, since 2×18194890² = 662108044224200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2452 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (1210140).

Almost surely, 2^18194890 is an apocalyptic number.

18194890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18194890 is an abundant number, since it is smaller than the sum of its proper divisors (20529590).

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

18194890 is a wasteful number, since it uses less digits than its factorization.

18194890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9006.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18194890 is about 4265.5468582586. The cubic root of 18194890 is about 263.0165911647.

The spelling of 18194890 in words is "eighteen million, one hundred ninety-four thousand, eight hundred ninety".