18106840 has 16 divisors (see below), whose sum is σ = 40740480. Its totient is φ = 7242720.

The previous prime is 18106831. The next prime is 18106841. The reversal of 18106840 is 4860181.

It is a junction number, because it is equal to n+sod(n) for n = 18106799 and 18106808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18106841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226296 + ... + 226375.

It is an arithmetic number, because the mean of its divisors is an integer number (2546280).

Almost surely, 2^18106840 is an apocalyptic number.

18106840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18106840 is an abundant number, since it is smaller than the sum of its proper divisors (22633640).

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

18106840 is a wasteful number, since it uses less digits than its factorization.

18106840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452682 (or 452678 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18106840 is about 4255.2132731509. The cubic root of 18106840 is about 262.5916354300.

The spelling of 18106840 in words is "eighteen million, one hundred six thousand, eight hundred forty".