18190940 has 12 divisors (see below), whose sum is σ = 38201016. Its totient is φ = 7276368.

The previous prime is 18190919. The next prime is 18190967. The reversal of 18190940 is 4909181.

It is a junction number, because it is equal to n+sod(n) for n = 18190897 and 18190906.

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 in 3 ways as a sum of consecutive naturals, for example, 454754 + ... + 454793.

It is an arithmetic number, because the mean of its divisors is an integer number (3183418).

Almost surely, 2^18190940 is an apocalyptic number.

18190940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18190940 is an abundant number, since it is smaller than the sum of its proper divisors (20010076).

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

18190940 is a wasteful number, since it uses less digits than its factorization.

18190940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909556 (or 909554 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18190940 is about 4265.0838209817. The cubic root of 18190940 is about 262.9975566862.

The spelling of 18190940 in words is "eighteen million, one hundred ninety thousand, nine hundred forty".