18169940 has 24 divisors (see below), whose sum is σ = 40402152. Its totient is φ = 6840320.

The previous prime is 18169927. The next prime is 18169967. The reversal of 18169940 is 4996181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4963984 + 13205956 = 2228^2 + 3634^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18169894 and 18169903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26381 + ... + 27060.

It is an arithmetic number, because the mean of its divisors is an integer number (1683423).

Almost surely, 2^18169940 is an apocalyptic number.

18169940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18169940 is an abundant number, since it is smaller than the sum of its proper divisors (22232212).

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

18169940 is a wasteful number, since it uses less digits than its factorization.

18169940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53467 (or 53465 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18169940 is about 4262.6212592723. The cubic root of 18169940 is about 262.8963144319.

The spelling of 18169940 in words is "eighteen million, one hundred sixty-nine thousand, nine hundred forty".