18417040 has 20 divisors (see below), whose sum is σ = 42819804. Its totient is φ = 7366784.

The previous prime is 18417031. The next prime is 18417067. The reversal of 18417040 is 4071481.

It can be written as a sum of positive squares in 2 ways, for example, as 9560464 + 8856576 = 3092^2 + 2976^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 18416996 and 18417014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115027 + ... + 115186.

Almost surely, 2^18417040 is an apocalyptic number.

18417040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18417040 is an abundant number, since it is smaller than the sum of its proper divisors (24402764).

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

18417040 is a wasteful number, since it uses less digits than its factorization.

18417040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230226 (or 230220 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18417040 is about 4291.5078935032. The cubic root of 18417040 is about 264.0826952448.

The spelling of 18417040 in words is "eighteen million, four hundred seventeen thousand, forty".