18269640 has 96 divisors (see below), whose sum is σ = 62524800. Its totient is φ = 4613760.

The previous prime is 18269639. The next prime is 18269663. The reversal of 18269640 is 4696281.

18269640 is a `hidden beast` number, since 1 + 8 + 2 + 6 + 9 + 640 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18269595 and 18269604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5505 + ... + 8175.

It is an arithmetic number, because the mean of its divisors is an integer number (651300).

Almost surely, 2^18269640 is an apocalyptic number.

18269640 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 18269640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31262400).

18269640 is an abundant number, since it is smaller than the sum of its proper divisors (44255160).

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

18269640 is a wasteful number, since it uses less digits than its factorization.

18269640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18269640 is about 4274.2999426807. The cubic root of 18269640 is about 263.3762824070.

The spelling of 18269640 in words is "eighteen million, two hundred sixty-nine thousand, six hundred forty".