18175940 has 12 divisors (see below), whose sum is σ = 38169516. Its totient is φ = 7270368.

The previous prime is 18175939. The next prime is 18175943. The reversal of 18175940 is 4957181.

It can be written as a sum of positive squares in 2 ways, for example, as 8491396 + 9684544 = 2914^2 + 3112^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18175940.

It is not an unprimeable number, because it can be changed into a prime (18175943) 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, 454379 + ... + 454418.

It is an arithmetic number, because the mean of its divisors is an integer number (3180793).

Almost surely, 2^18175940 is an apocalyptic number.

18175940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18175940 is an abundant number, since it is smaller than the sum of its proper divisors (19993576).

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

18175940 is a wasteful number, since it uses less digits than its factorization.

18175940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908806 (or 908804 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18175940 is about 4263.3249934763. The cubic root of 18175940 is about 262.9252487467.

The spelling of 18175940 in words is "eighteen million, one hundred seventy-five thousand, nine hundred forty".