18294640 has 120 divisors (see below), whose sum is σ = 53434080. Its totient is φ = 5773824.

The previous prime is 18294629. The next prime is 18294649. The reversal of 18294640 is 4649281.

It is a junction number, because it is equal to n+sod(n) for n = 18294596 and 18294605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18294649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50781 + ... + 51139.

It is an arithmetic number, because the mean of its divisors is an integer number (445284).

Almost surely, 2^18294640 is an apocalyptic number.

18294640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18294640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26717040).

18294640 is an abundant number, since it is smaller than the sum of its proper divisors (35139440).

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

18294640 is a wasteful number, since it uses less digits than its factorization.

18294640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 18294640 is about 4277.2233984210. The cubic root of 18294640 is about 263.4963615108.

The spelling of 18294640 in words is "eighteen million, two hundred ninety-four thousand, six hundred forty".